c语言学生管理成绩
❶ 学生成绩管理： c语言
参考代码如下，不过还是建议自己写一写比较好：
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct student //结构体
{
char name[20]; //姓名
char number[20]; //学号
double math; //数学
double english; //英语
double chinese; //语文
double program; //程序
}s[50];
void head() //界面
{
printf(
"**********************************************************************\n"
"** **\n"
"** **\n"
"** 学生成绩管理系统 **\n"
"** **\n"
"** 1.信息录入 **\n"
"** 2.信息统计 **\n"
"** 3.信息浏览 **\n"
"** 4.信息查询 **\n"
"** 5.信息排序 **\n"
"** 6.信息删除 **\n"
"** 0.退出系统 **\n"
"** **\n"
"**********************************************************************\n"
);
}
void ru(struct student s[], int* n) //文件导入函数
{
FILE *p;
int i=*n;
if((p=fopen("数据.txt", "r"))==NULL)
{
n=n;
}
else
{
while(!feof(p))
{
fscanf(p, "%s%s%lf%lf%lf%lf\n", s[i].name, s[i].number, &s[i].math, &s[i].english, &s[i].chinese, &s[i].program);
i++;
*n=*n+1;
}
}
fclose(p);
}
void chu(struct student s[], int n)
{
FILE *p;
int i=0;
if((p=fopen("数据.txt", "w"))==NULL)
{
printf("无法打开此文件！");
}
else
{
while(i<n-1)
{
fprintf(p, "%s %s %lf %lf %lf %lf\n", s[i].name, s[i].number, s[i].math, s[i].english, s[i].chinese, s[i].program);
i++;
}
fprintf(p, "%s %s %lf %lf %lf %lf", s[i].name, s[i].number, s[i].math, s[i].english, s[i].chinese, s[i].program);
}
fclose(p);
}
void dayin(struct student s[], int n) //显示所有信息
{
int i;
double all=0.0;
printf("\n姓名\t\t学号\t\t数学\t英语\t语文\t程序\t总分\n");
for (i=0; i<n; i++)
{
all=s[i].math+s[i].english+s[i].chinese+s[i].program;
printf("%s\t\t%s\t\t%.1lf\t%.1lf\t%.1lf\t%.1lf\t%.1lf\n", s[i].name, s[i].number, s[i].math, s[i].english, s[i].chinese, s[i].program, all);
}
}
void shuru(struct student s[], int* n) //信息输入函数
{
int i=*n, j, k, m;
printf("请输入学生姓名:");
scanf("%s", s[i].name);
printf("请输入学生学号:");
for (j=0; ; j++)
{
m=0;
scanf("%s", s[i].number);
for (k=0; k<i; k++)
{
if (strcmp(s[i].number, s[k].number)==0)
{
m=m+1;
printf("学号重复，请重新输入学号:");
break;
}
}
if (m==0)
{
break;
}
}
printf("请输入数学成绩:");
scanf("%lf", &s[i].math);
printf("请输入英语成绩:");
scanf("%lf", &s[i].english);
printf("请输入语文成绩:");
scanf("%lf", &s[i].chinese);
printf("请输入程序成绩:") ;
scanf("%lf", &s[i].program);
printf("添加信息成功！\n");
*n=*n+1;
chu(s, *n);
}
void paixu(struct student s[], int n) //排序函数
{
int i, j;
double all1, all2;
struct student stu;
for (i=0; i<n-1; i++)
{
for (j=i+1; j<n; j++)
{
all1=s[i].math+s[i].english+s[i].chinese+s[i].program;
all2=s[j].math+s[j].english+s[j].chinese+s[j].program;
if (all1<all2)
{
stu=s[i];
s[i]=s[j];
s[j]=stu;
}
}
}
printf("排序后的数据：\n");
dayin(s, n);
}
void chazhao(struct student s[], int n) //查找函数
{
char name[20], num[20];
int m1, m2=0, i, j;
printf("1.按姓名查找\n2.按学号查找\n选择查询方式（1或2）:");
scanf("%d", &m1);
if (m1==1)
{
printf("请输入您要查找的学生姓名:");
scanf("%s", name);
for (i=0; i<n; i++)
{
if (strcmp(s[i].name, name)==0)
{
m2=m2+1;
if (m2==1)
{
printf("\n姓名\t\t学号\t数学\t英语\t语文\t程序\n");
}
printf("%s\t\t%s\t\t%s\t\t%s\t\t%s\n", s[i].name, s[i].number, s[i].math, s[i].english, s[i].chinese, s[i].program);
}
}
if (m2==0)
{
printf("没有此学生信息!\n");
}
}
else if (m1==2)
{
printf("请输入您要查找的学生学号:");
scanf("%s", num);
j=0;
for (i=0; i<n; i++)
{
if (strcmp(s[i].number, num)==0)
{
m2=m2+1;
if (m2==1)
{
printf("\n姓名\t\t学号\t数学\t英语\t语文\t程序\n");
}
printf("%s\t\t%s\t\t%s\t\t%s\t\t%s\n", s[i].name, s[i].number, s[i].math, s[i].english, s[i].chinese, s[i].program);
}
}
if (m2==0)
{
printf("没有此学生信息!\n");
}
}
}
void shanchu(struct student s[], int* n) //删除函数
{
char num[20];
int m=0, i, j;
printf("请输入您要删除的学生学号:");
scanf("%s", num);
for (i=0; i<=*n; i++)
{
if (strcmp(s[i].number, num)==0)
{
m=m+1;
for (j=i; j<*n; j++)
{
s[j]=s[j+1];
}
*n=*n-1;
}
}
if (m==0)
{
printf("没有此学生信息!\n");
}
else
{
chu(s, *n);
printf("删除完毕!\n");
}
}
void allAndAver(struct student s[], int n)
{
int i ;
double all=0.0, aver=0.0;
for (i=0; i<n; i++)
{
all=s[i].math+s[i].english+s[i].chinese+s[i].program;
aver=all/4;
printf("%s\t\t%s\t\t%.1lf\t%.1lf\n", s[i].name, s[i].number, all, aver);
}
}
void Fail(struct student s[], int n) //统计单科不及格人数
{
int i, fail[4]={0};
for (i=0; i<n; i++)
{
if (s[i].math<60)
{
fail[0]++;
}
if (s[i].english<60)
{
fail[1]++;
}
if (s[i].chinese<60)
{
fail[2]++;
}
if (s[i].program<60)
{
fail[3]++;
}
}
printf("\n不及格信息：\n");
printf("数学不及格的人数为：%d人\n", fail[0]);
printf("英语不及格的人数为：%d人\n", fail[1]);
printf("语文不及格的人数为：%d人\n", fail[2]);
printf("程序不及格的人数为：%d人\n", fail[3]);
}
void Max(struct student s[], int n) //统计单科最高分人数
{
int i, counter[4]={0};
double max[4]={s[0].math, s[0].english, s[0].chinese, s[0].program};
for (i=0; i<n; i++)
{
if (s[i].math>max[0])
{
max[0]=s[i].math;
}
if (s[i].math>max[1])
{
max[1]=s[i].math;
}
if (s[i].math>max[2])
{
max[2]=s[i].math;
}
if (s[i].math>max[3])
{
max[3]=s[i].math;
}
}
for (i=0; i<n; i++)
{
if (s[i].math==max[0])
{
counter[0]++;
}
if (s[i].math==max[1])
{
counter[1]++;
}
if (s[i].math==max[2])
{
counter[2]++;
}
if (s[i].math==max[3])
{
counter[3]++;
}
}
printf("\n最高分信息：\n");
printf("数学最高分为：%.1lf, 人数为：%d人\n", max[0], counter[0]);
printf("英语最高分为：%.1lf, 人数为：%d人\n", max[1], counter[1]);
printf("语文最高分为：%.1lf, 人数为：%d人\n", max[2], counter[2]);
printf("程序最高分为：%.1lf, 人数为：%d人\n", max[3], counter[3]);
}
void Min(struct student s[], int n) //统计单科最低分人数
{
int i, counter[4]={0};
double min[4]={s[0].math, s[0].english, s[0].chinese, s[0].program};
for (i=0; i<n; i++)
{
if (s[i].math<min[0])
{
min[0]=s[i].math;
}
if (s[i].math<min[1])
{
min[1]=s[i].math;
}
if (s[i].math<min[2])
{
min[2]=s[i].math;
}
if (s[i].math<min[3])
{
min[3]=s[i].math;
}
}
for (i=0; i<n; i++)
{
if (s[i].math==min[0])
{
counter[0]++;
}
if (s[i].math==min[1])
{
counter[1]++;
}
if (s[i].math==min[2])
{
counter[2]++;
}
if (s[i].math==min[3])
{
counter[3]++;
}
}
printf("\n最低分信息：\n");
printf("数学最低分为：%.1lf, 人数为：%d人\n", min[0], counter[0]);
printf("英语最低分为：%.1lf, 人数为：%d人\n", min[1], counter[1]);
printf("语文最低分为：%.1lf, 人数为：%d人\n", min[2], counter[2]);
printf("程序最低分为：%.1lf, 人数为：%d人\n", min[3], counter[3]);
}
void tongji(struct student s[], int n) //统计函数
{
printf("统计信息如下：\n");
printf("\n姓名\t\t学号\t\t总分\t平均分\n");
allAndAver(s, n);
Max(s, n);
Min(s, n) ;
Fail(s, n);
}
int main() //主函数
{
int k, n=0;
ru(s, &n);
chu(s, n);
while (1)
{
head();
printf("\n请按对应的键选择相应的功能:");
scanf("%d",&k);
switch (k)
{
case 1:
shuru(s, &n);
break;
case 2:
tongji(s, n);
break;
case 3:
dayin(s, n);
break;
case 4:
chazhao(s, n);
break;
case 5:
paixu(s, n);
break;
case 6:
shanchu(s, &n);
break;
case 0:
exit(1);
break;
default : printf("请输入正确的命令!\n");
}
system("pause");
system("cls");
}
return 0;
}
❷ c语言学生成绩管理系统
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
int shoudsave=0; /* */
struct student
{
char num[10];/* 学号 */
char name[20];
char sex[4];
int cgrade;
int mgrade;
int egrade;
int totle;
int ave;
char neartime[10];/* 最近更新时间 */
};
typedef struct node
{
struct student data;
struct node *next;
}Node,*Link;
void menu()
{
printf("********************************************************************************");
printf("\t1登记学生资料\t\t\t\t\t2删除学生资料\n");
printf("\t3查询学生资料\t\t\t\t\t4修改学生资料\n");
printf("\t5保存学生资料\t\t\t\t\t0退出系统\n");
printf("********************************************************************************\n");
}
void printstart()
{
printf("-----------------------------------------------------------------------\n");
}
void Wrong()
{
printf("\n=====>提示:输入错误!\n");
}
void Nofind()
{
printf("\n=====>提示:没有找到该学生!\n");
}
void printc() /* 本函数用于输出中文 */
{
printf(" 学号\t 姓名 性别 英语成绩 数学成绩 C语言成绩 总分 平均分\n");
}
void printe(Node *p)/* 本函数用于输出英文 */
{
printf("%-12s%s\t%s\t%d\t%d\t%d\t %d\t %d\n",p->data.num,p->data.name,p->data.sex,p->data.egrade,p->data.mgrade,p->data.cgrade,p->data.totle,p->data.ave);
}
Node* Locate(Link l,char findmess[],char nameornum[]) /* 该函数用于定位连表中符合要求的接点，并返回该指针 */
{
Node *r;
if(strcmp(nameornum,"num")==0) /* 按学号查询 */
{
r=l->next;
while(r!=NULL)
{
if(strcmp(r->data.num,findmess)==0)
return r;
r=r->next;
}
}
else if(strcmp(nameornum,"name")==0) /* 按姓名查询 */
{
r=l->next;
while(r!=NULL)
{
if(strcmp(r->data.name,findmess)==0)
return r;
r=r->next;
}
}
return 0;
}
void Add(Link l) /* 增加学生 */
{
Node *p,*r,*s;
char num[10];
r=l;
s=l->next;
while(r->next!=NULL)
r=r->next; /* 将指针置于最末尾 */
while(1)
{
printf("请你输入学号(以'0'返回上一级菜单:)");
scanf("%s",num);
if(strcmp(num,"0")==0)
break;
while(s)
{
if(strcmp(s->data.num,num)==0)
{
printf("=====>提示:学号为'%s'的学生已经存在,若要修改请你选择'4 修改'!\n",num);
printstart();
printc();
printe(s);
printstart();
printf("\n");
return;
}
s=s->next;
}
p=(Node *)malloc(sizeof(Node));
strcpy(p->data.num,num);
printf("请你输入姓名:");
scanf("%s",p->data.name);
getchar();
printf("请你输入性别:");
scanf("%s",p->data.sex);
getchar();
printf("请你输入c语言成绩:");
scanf("%d",&p->data.cgrade);
getchar();
printf("请你输入数学成绩:");
scanf("%d",&p->data.mgrade);
getchar();
printf("请你输入英语成绩:");
scanf("%d",&p->data.egrade);
getchar();
p->data.totle=p->data.egrade+p->data.cgrade+p->data.mgrade;
p->data.ave=p->data.totle / 3;
/* 信息输入已经完成 */
p->next=NULL;
r->next=p;
r=p;
shoudsave=1;
}
}
void Qur(Link l) /* 查询学生 */
{
int sel;
char findmess[20];
Node *p;
if(!l->next)
{
printf("\n=====>提示:没有资料可以查询!\n");
return;
}
printf("\n=====>1按学号查找\n=====>2按姓名查找\n");
scanf("%d",&sel);
if(sel==1)/* 学号 */
{
printf("请你输入要查找的学号:");
scanf("%s",findmess);
p=Locate(l,findmess,"num");
if(p)
{
printf("\t\t\t\t查找结果\n");
printstart();
printc();
printe(p);
printstart();
}
else
Nofind();
}
else if(sel==2) /* 姓名 */
{
printf("请你输入要查找的姓名:");
scanf("%s",findmess);
p=Locate(l,findmess,"name");
if(p)
{
printf("\t\t\t\t查找结果\n");
printstart();
printc();
printe(p);
printstart();
}
else
Nofind();
}
else
Wrong();
}
void Del(Link l) /* 删除 */
{
int sel;
Node *p,*r;
char findmess[20];
if(!l->next)
{
printf("\n=====>提示:没有资料可以删除!\n");
return;
}
printf("\n=====>1按学号删除\n=====>2按姓名删除\n");
scanf("%d",&sel);
if(sel==1)
{
printf("请你输入要删除的学号:");
scanf("%s",findmess);
p=Locate(l,findmess,"num");
if(p)
{
r=l;
while(r->next!=p)
r=r->next;
r->next=p->next;
free(p);
printf("\n=====>提示:该学生已经成功删除!\n");
shoudsave=1;
}
else
Nofind();
}
else if(sel==2)
{
printf("请你输入要删除的姓名:");
scanf("%s",findmess);
p=Locate(l,findmess,"name");
if(p)
{
r=l;
while(r->next!=p)
r=r->next;
r->next=p->next;
free(p);
printf("\n=====>提示:该学生已经成功删除!\n");
shoudsave=1;
}
else
Nofind();
}
else
Wrong();
}
void Modify(Link l)
{
Node *p;
char findmess[20];
if(!l->next)
{
printf("\n=====>提示:没有资料可以修改!\n");
return;
}
printf("请你输入要修改的学生学号:");
scanf("%s",findmess);
p=Locate(l,findmess,"num");
if(p)
{
printf("请你输入新学号(原来是%s):",p->data.num);
scanf("%s",p->data.num);
printf("请你输入新姓名(原来是%s):",p->data.name);
scanf("%s",p->data.name);
getchar();
printf("请你输入新性别(原来是%s):",p->data.sex);
scanf("%s",p->data.sex);
printf("请你输入新的c语言成绩(原来是%d分):",p->data.cgrade);
scanf("%d",&p->data.cgrade);
getchar();
printf("请你输入新的数学成绩(原来是%d分):",p->data.mgrade);
scanf("%d",&p->data.mgrade);
getchar();
printf("请你输入新的英语成绩(原来是%d分):",p->data.egrade);
scanf("%d",&p->data.egrade);
p->data.totle=p->data.egrade+p->data.cgrade+p->data.mgrade;
p->data.ave=p->data.totle/3;
printf("\n=====>提示:资料修改成功!\n");
shoudsave=1;
}
else
Nofind();
}
void Disp(Link l)
{
int count=0;
Node *p;
p=l->next;
if(!p)
{
printf("\n=====>提示:没有资料可以显示!\n");
return;
}
printf("\t\t\t\t显示结果\n");
printstart();
printc();
printf("\n");
while(p)
{
printe(p);
p=p->next;
}
printstart();
printf("\n");
}
void Tongji(Link l)
{
Node *pm,*pe,*pc,*pt,*pa; /* 用于指向分数最高的接点 */
Node *r=l->next;
if(!r)
{
printf("\n=====>提示:没有资料可以统计!\n");
return ;
}
pm=pe=pc=pt=pa=r;
while(r!=NULL)
{
if(r->data.cgrade>=pc->data.cgrade)
pc=r;
if(r->data.mgrade>=pm->data.mgrade)
pm=r;
if(r->data.egrade>=pe->data.egrade)
pe=r;
if(r->data.totle>=pt->data.totle)
pt=r;
if(r->data.ave>=pa->data.ave)
pa=r;
r=r->next;
}
printf("------------------------------统计结果--------------------------------\n");
printf("总分最高者:\t%s %d分\n",pt->data.name,pt->data.totle);
printf("平均分最高者:\t%s %d分\n",pa->data.name,pa->data.ave);
printf("英语最高者:\t%s %d分\n",pe->data.name,pe->data.egrade);
printf("数学最高者:\t%s %d分\n",pm->data.name,pm->data.mgrade);
printf("c语言最高者:\t%s %d分\n",pc->data.name,pc->data.cgrade);
printstart();
}
void Sort(Link l)
{
Link ll;
Node *p,*rr,*s;
ll=(Link)malloc(sizeof(Node)); /* 用于做新的连表 */
ll->next=NULL;
if(l->next==NULL)
{
printf("\n=====>提示:没有资料可以排序!\n");
return ;
}
p=l->next;
while(p)
{
s=(Node*)malloc(sizeof(Node)); /* 新建接点用于保存信息 */
s->data=p->data;
s->next=NULL;
rr=ll;
while(rr->next!=NULL && rr->next->data.totle>=p->data.totle)
rr=rr->next;
if(rr->next==NULL)
rr->next=s;
else
{
s->next=rr->next;
rr->next=s;
}
p=p->next;
}
free(l);
l->next=ll->next;
printf("\n=====>提示:排序已经完成!\n");
}
void Save(Link l)
{
FILE* fp;
Node *p;
int flag=1,count=0;
fp=fopen("c:\\student","wb");
if(fp==NULL)
{
printf("\n=====>提示:重新打开文件时发生错误!\n");
exit(1);
}
p=l->next;
while(p)
{
if(fwrite(p,sizeof(Node),1,fp)==1)
{
p=p->next;
count++;
}
else
{
flag=0;
break;
}
}
if(flag)
{
printf("\n=====>提示:文件保存成功.(有%d条记录已经保存.)\n",count);
shoudsave=0;
}
fclose(fp);
}
void main()
{
Link l;/* 连表 */
FILE *fp; /* 文件指针 */
int sel;
char ch;
char jian;
int count=0;
Node *p,*r;
printf("\t\t\t\t学生成绩管理系统\n\t\t\t\t-------西京学院本科部机制0502 彭琛(41号)\n");
l=(Node*)malloc(sizeof(Node));
l->next=NULL;
r=l;
fp=fopen("C:\\student","rb");
if(fp==NULL)
{
printf("\n=====>提示:文件还不存在，是否创建？(y/n)\n");
scanf("%c",&jian);
if(jian=='y'||jian=='Y')
fp=fopen("C:\\student","wb");
else
exit(0);
}
printf("\n=====>提示:文件已经打开,正在导入记录......\n");
while(!feof(fp))
{
p=(Node*)malloc(sizeof(Node));
if(fread(p,sizeof(Node),1,fp)) /* 将文件的内容放入接点中 */
{
p->next=NULL;
r->next=p;
r=p; /* 将该接点挂入连中 */
count++;
}
}
fclose(fp); /* 关闭文件 */
printf("\n=====>提示:记录导入完毕,共导入%d条记录.\n",count);
while(1)
{
menu();
printf("请你选择操作:");
scanf("%d",&sel);
if(sel==0)
{
if(shoudsave==1)
{ getchar();
printf("\n=====>提示:资料已经改动,是否将改动保存到文件中(y/n)?\n");
scanf("%c",&ch);
if(ch=='y'||ch=='Y')
Save(l);
}
printf("\n=====>提示:你已经退出系统,再见!\n");
break;
}
switch(sel)
{
case 1:Add(l);break; /* 增加学生 */
case 2:Del(l);break;/* 删除学生 */
case 3:Qur(l);break;/* 查询学生 */
case 4:Modify(l);break;/* 修改学生 */
case 5:Save(l);break;/* 保存学生 */
case 9:printf("\t\t\t==========帮助信息==========\n");break;
default: Wrong();getchar();break;
}
}
}
/* */
❸ c语言：学生成绩简单管理程序
给你一个模板吧：
#include"stdio.h"
#include"stdlib.h"
#include"string.h"
#include<conio.h>
#include<malloc.h>
typedef struct list
{
char name[20];
char num[12];
char telephone[12];
int score;
struct list *next;
}list,*lnode;
lnode init()
{
lnode L=(lnode)malloc(sizeof(list));
L->next=NULL;
return L;
}
lnode clear(lnode L)
{
L->next=NULL;
return L;
}
lnode insert(lnode L,char name[],char num[],char telephone[],int score)
{
lnode p,q=L;
p=(lnode)malloc(sizeof(list));
p->next=NULL;
strcpy(p->name,name);
strcpy(p->num,num);
strcpy(p->telephone,telephone);
p->score=score;
if(q->next==NULL)
q->next=p;
else
{
while(q->next!=NULL)
{
q=q->next;
}
q->next=p;
}
return L;
}
void scan()
{
printf("\t\t\t****欢迎使用学生通讯录***\t\t\t\n\n");
printf("\t\t\t%c 1: 插入联系人\t%c\n\n",5,5);
printf("\t\t\t%c 2:删除联系人\t\t%c\n\n",5,5);
printf("\t\t\t%c 3:显示所有联系人\t%c\n\n",5,5);
printf("\t\t\t%c 4:查找联系人\t\t%c\n\n",5,5);
printf("\t\t\t%c 5:清空\t\t%c\n\n",5,5);
printf("\t\t\t%c 6:保存为文本文件\t%c\n\n",5,5);
printf("\t\t\t%c 其他键退出\t\t%c\n\n",5,5);
printf("\t\t\t******按0显示主菜单******\t\t\t\n");
}
void search(lnode L)
{
lnode p=L;
int n=0;
char a[20];
if(p->next!=NULL)
{
printf("请选择：\n");
printf("1:按姓名查找\t\t\t2:按学号查找\n");
scanf("%d",&n);
switch(n)
{
case 1:
printf("请输入姓名\n");
scanf("%s",a);
while(strcmp(p->name,a)!=0&&p->next!=NULL)
{
p=p->next;
}
if(strcmp(p->name,a)==0){
printf("fp","姓名\t学号\t电话\t学分\n");
printf("%s\t%s\t%s\t%d",p->name,p->num,p->telephone,p->score);
}
else
{
printf("未找到联系人");
}
break;
case 2:
printf("请输入学号\n");
scanf("%s",a);
while(strcmp(p->num,a)!=0&&p->next!=NULL)
{
p=p->next;
}
if(strcmp(p->num,a)==0){
printf("姓名\t学号\t电话\t学分");
printf("%s\t%s\t%s\t%d",p->name,p->num,p->telephone,p->score);
}
else
{
printf("未找到联系人");
}
break;
default:
n=0;
break;
}
}
else
printf("通讯录为空，请插入\n");
}
lnode deletel(lnode L)
{
int n=0;
char a[20];
lnode p=L,pre=NULL;
if(p->next!=NULL)
{
printf("请选择:/n1:姓名删除\t2:按学号删除\t");
scanf("%d",&n);
switch(n)
{
case 1:
p=L;
printf("请输入姓名");
scanf("%s",a);
while(strcmp(p->name,a)!=0&&p->next!=NULL)
{
pre=p;
p=p->next;
}
if(strcmp(p->name,a)==0)
{
pre->next=p->next;
free(p);
printf("删除成功\n请选择\n");
return L;
break;
}
else
printf("未找到此联系人");
return L;
break;
case 2:
printf("请输入学号");
scanf("%s",a);
p=L;
while(strcmp(p->num,a)!=0&&p->next!=NULL)
{
pre=p;
p=p->next;
}
if(strcmp(p->num,a)==0)
{
pre->next=p->next;
free(p);
printf("删除成功\n请选择\n");
return L;
break;
}
else
printf("未找到此联系人\n");
return L;
break;
}
}
else
printf("通讯录为空\n");
return L;
}
void display(lnode L)
{
lnode p=L;
if(p->next==NULL)
printf("未插入联系人\n");
else
{
for(p=L->next;p!=NULL;p=p->next)
{
printf("姓名\t学号\t电话\t学分\n");
printf("%s\t%s\t%s\t%d\n",p->name,p->num,p->telephone,p->score);
if(p->next==NULL) break;
}
}
}
void save(lnode L)
{
FILE *fp;
lnode p=L;
if((fp=fopen("学生信息管理.txt","w+"))==NULL)
printf("文件打开失败\n");
else
{
if(p->next!=NULL)
{
for(p=L->next;p!=NULL;p=p->next)
{
fprintf(fp,"姓名\t学号\t电话\t学分\n");
fprintf(fp,"%s\t%s\t%s\t%d",p->name,p->num,p->telephone,p->score);
}
if(p==NULL)
printf("文件保存成功");
}
else
printf("通讯录为空\n");
}
fclose(fp);
}
void main()
{
int n,score,k=1;
char name[20],num[20],telephone[20];
lnode L;
L=init();
printf("\t\t\t****欢迎使用学生通讯录***\t\t\t\n\n");
printf("\t\t\t%c 1: 插入联系人\t%c\n\n",5,5);
printf("\t\t\t%c 2:删除联系人\t\t%c\n\n",5,5);
printf("\t\t\t%c 3:显示所有联系人\t%c\n\n",5,5);
printf("\t\t\t%c 4:查找联系人\t\t%c\n\n",5,5);
printf("\t\t\t%c 5:清空\t\t%c\n\n",5,5);
printf("\t\t\t%c 6:保存为文本文件\t%c\n\n",5,5);
printf("\t\t\t%c 其他键退出\t\t%c\n\n",5,5);
printf("\t\t\t******按0显示主菜单******\t\t\t\n");
while(k)
{ scanf("%d",&n);
switch(n)
{
case 1:
printf("请输入姓名");
scanf("%s",name);
printf("请输入学号");
scanf("%s",num);
printf("请输入电话");
scanf("%s",telephone);
printf("请输入学分");
scanf("%d",&score);
L=insert(L,name,num,telephone,score);
printf("添加成功,请选择\n");
break;
case 2:
L=deletel(L);
break;
case 3:
display(L);
break;
case 4:
search(L);
break;
case 5:
L=clear(L);
case 6:
save(L);
break;
case 0:
scan();
break;
default:
k=0;
}
}
printf("************************谢谢使用****************************");
}
❹ c语言 学生成绩管理程序
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct stu
{
int num;//编号
char name[30];//姓名
char fm[30];//性别
char tel[30];//电话号码
char dz[30];//地址
int cj;//成绩
int sum;//排名
};
int i=0;
int z;
void ss1(struct stu u[]);
void ss2(struct stu u[]);
void ss3(struct stu u[]);
void ss4(struct stu u[]);
void ss5(struct stu u[]);
void ss6(struct stu u[]);
void main()
{
int x;
char m;
struct stu u[40];
printf("---------------欢迎使用通讯录----------------------\n");
do
{
printf("学号:%d\n",i+1);
u[i].num=i+1;
printf("姓名:\n");
scanf("%s",u[i].name);
printf("性别:\n");
scanf("%s",u[i].fm);
printf("电话号码:\n");
scanf("%s",u[i].tel);
printf("地址:\n");
scanf("%s",u[i].dz);
printf("成绩:\n");
scanf("%d",&u[i].cj);
i++;
printf("是否继续输入?(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
do
{
printf("〓 通讯录 〓\n");
printf("〓 0.退 出 〓\n");
printf("〓 1.查 找 〓\n");
printf("〓 2.添 加 〓\n");
printf("〓 3.删 除 〓\n");
printf("〓 4.修 改 〓\n");
printf("〓 5.浏览信息 〓\n");
printf("〓 6.成绩排名 〓\n");
printf("〓〓〓〓〓〓〓〓〓〓〓〓〓\n");
printf("请选择:\n");
scanf("%d",&x);
switch(x)
{
case 0:exit(0);break;
case 1:ss1(u);break;
case 2:ss2(u);break;
case 3:ss3(u);break;
case 4:ss4(u);break;
case 5:ss5(u);break;
case 6:ss6(u);break;
}
printf("是否选择其它功能(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
}
void ss1(struct stu u[])
{
char name[20];
int j;
printf("请输入您要查找的姓名");
scanf("%s",name);
for(j=0;j<i;j++)
{
if(strcmp(u[j].name,name)==0)
break;
}
if(j==i)
printf("查无此人");
else
printf("学号:%d 姓名:%s 电话号码%s 地址%s 成绩%d\n",u[j].num,u[j].name,u[j].tel,u[j].dz,u[j].cj);
}
void ss2(struct stu u[])
{
char m;
do
{
printf("学号:%d\n",z+1);
u[i].num=z+1;
printf("姓名:\n");
scanf("%s",u[i].name);
printf("性别:\n");
scanf("%s",u[i].fm);
printf("电话号码\n");
scanf("%s",u[i].tel);
printf("地址:\n");
scanf("%s",u[i].dz);
printf("成绩:\n");
scanf("%d",&u[i].cj);
z++;
i++;
printf("是否继续输入?(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
}
void ss3(struct stu u[])
{
int j,k,num;
printf("请输入您要删除的学号");
scanf("%d",&num);
for(j=0;j<i;j++)
{
if(u[j].num==num)
break;
}
if(j==i)
printf("查无此人");
else
{
for(k=j;k<i-1;k++)
{
u[k]=u[k+1];
}
z=i;
i--;
printf("---------------------删除成功---------------------\n");
}
}
void ss4(struct stu u[])
{
int num,j,k;
char m;
printf("请选择您要修改的学号:");
scanf("%d",&num);
for(j=0;j<i;j++)
{
if(u[j].num==num)
break;
}
if(j==i)
printf("查无此人");
else
{
do
{
printf("学号:%d\n",num);
u[i].num=num;
for(k=j;k<i-1;k++)
{
u[k]=u[k+1];
}
i--;
printf("姓名:\n");
scanf("%s",u[i].name);
printf("性别:\n");
scanf("%s",u[i].fm);
printf("电话号码\n");
scanf("%s",u[i].tel);
printf("地址:\n");
scanf("%s",u[i].dz);
printf("成绩:\n");
scanf("%d",&u[i].cj);
i++;
printf("-----------------------修改完毕-----------------------\n");
printf("是否继续输入?(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
}
}
void ss5(struct stu u[])
{
int j;
for(j=0;j<i;j++)
{
printf("学号:%d 姓名:%s 电话号码%s 地址%s 成绩%d\n",u[j].num,u[j].name,u[j].tel,u[j].dz,u[j].cj);
}
if(i==0)
{
printf("当前没有信息");
}
}
void ss6(struct stu u[])
{
int j,k,h;
char p[30];
int sum=0;
for(j=0;j<i-1;j++)
{
for(k=j+1;k<i;k++)
{
if(u[j].cj<u[k].cj)
{
h=u[j].cj;
u[j].cj=u[k].cj;
u[k].cj=h;
h=u[j].num;
u[j].num=u[k].num;
u[k].num=h;
strcpy(p,u[j].name);
strcpy(u[j].name,u[k].name);
strcpy(u[k].name,p);
strcpy(p,u[j].tel);
strcpy(u[j].tel,u[k].tel);
strcpy(u[k].tel,p);
strcpy(p,u[j].dz);
strcpy(u[j].dz,u[k].dz);
strcpy(u[k].dz,p);
}
}
}
for(j=0;j<i;j++)
{
printf("排名:%d学号:%d 姓名:%s 电话号码%s 地址%s 成绩%d\n",sum+1,u[j].num,u[j].name,u[j].tel,u[j].dz,u[j].cj);
sum++;
}
}
❺ c语言 学生成绩管理
||#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<conio.h>
struct student
{ char num[10];
char name[20];
char sex[5];
float grade[3];
float v;
float sum;
}stu[50];
int k=0;
void input();
void display();
void lookandchange();
void average();
void paixu();
void save();
void main()
{
int a;
do
{
printf("\n\n ******************************************************************\n");
printf(" *"); printf("\t\twelcome enter the student management system"); printf("\t*");
printf("\n ******************************************************************\n");
printf(" *"); printf("\t 1.Access student information"); printf("\t\t\t\t*\n");
printf(" *"); printf("\t 2.Display student information"); printf("\t\t\t\t*\n");
printf(" *"); printf("\t 3.LookandChange student information"); printf("\t\t\t*\n");
printf(" *"); printf("\t 4.By sum Sort student information and output"); printf("\t\t*\n");
printf(" *"); printf("\t 5.save the student information"); printf("\t\t\t*\n");
printf(" *"); printf("\t 6. exit "); printf("\t\t\t\t\t*\n");
printf(" ******************************************************************\n");
printf(" Enter you choice : ");
scanf("%d",&a);
switch(a)
{
case 1:printf("\n");input();break;
case 2:printf("\n");display();break;
case 3:printf("\n");lookandchange();break;
case 4:printf("\n");paixu();break;
case 5:printf("\n");save();break;
case 6:printf("\n");exit(0);break;
default:printf("\nThe choice is between 1 to 6.\n");
}
}while(a!=0);
}
void input()
{ int j;
char ch[20];
printf("\nenter student information:\n");
do
{ printf("\nnum: ");
scanf("%s",stu[k].num);
printf("\nname: ");
scanf("%s",stu[k].name);
printf("\nsex: ");
scanf("%s",stu[k].sex);
for(j=0;j<3;j++)
{ printf("\ngrade%d: ",j+1);
scanf("%f",&stu[k].grade[j]); }
k++;
printf("\nif want continue input student information(y/n): ");
scanf("%s",ch);
}while(strcmp(ch,"y")==0||strcmp(ch,"Y")==0);
average();
display();
}
void display()
{ int i;
printf(" the student information is:\n");
for(i=0;i<k;i++)
{ printf("%-10s %-10s %-5s %.2f %.2f %.2f %8f %8f\n",stu[i].num,stu[i].name,stu[i].sex,stu[i].grade[0],stu[i].grade[1],stu[i].grade[2],stu[i].sum,stu[i].v);
printf("\n"); }
}
void average()
{ int i,j;
for(i=0;i<k;i++)
{ stu[i].sum=0;
for(j=0;j<3;j++)
stu[i].sum=stu[i].sum+stu[i].grade[j] ;
stu[i].v=stu[i].sum/5; }
}
void lookandchange()
{ int pass[4]; int i,j,l,flag;
char a[20],ch[10],c[20];
printf("This is a database management system:\n");
for(l=0;l<3;l++)
{ flag=0;
printf(" please enter the password: ");
scanf("%1d%1d%1d%1d",&pass[0],&pass[1],&pass[2],&pass[3]);
for(i=0;i<4;i++)
if(pass[i]==i+1) flag=flag+1;
if(flag==4)
{ printf("\nenter you want look student num:");
scanf("%s",a);
for(i=0;i<k;i++)
if(strcmp(stu[i].num,a)==0) printf("%-10s %-10s %-5s %.2f %.2f %.2f %8f %8f\n",stu[i].num,stu[i].name,stu[i].sex,stu[i].grade[0],stu[i].grade[1],stu[i].grade[2],stu[i].sum,stu[i].v);
printf("\nenter you want look student name:");
scanf("%s",a);
for(i=0;i<k;i++)
if(strcmp(stu[i].name,a)==0) printf("%-10s %-10s %-5s %.2f %.2f %.2f %8f %8f\n",stu[i].num,stu[i].name,stu[i].sex,stu[i].grade[0],stu[i].grade[1],stu[i].grade[2],stu[i].sum,stu[i].v);
printf("\nenter you want change student num:");
scanf("%s",a);
for(i=0;i<k;i++)
{
if(strcmp(stu[i].num,a)==0)
{ printf("\nyou sure want change student num(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0)
printf("\nyou sure want change student name(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0)
printf("\nyou sure want change student sex(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0)
printf("\nyou sure want change student grade(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0)
for(j=0;j<3;j++)
stu[i].sum=0;
for(j=0;j<5;j++)
stu[i].sum=stu[i].sum+stu[i].grade[j] ;
stu[i].v=stu[i].sum/5;
}
} printf("\nyou sure want delete student information(y/n): ");
scanf("%s",ch);
if(strcmp(ch,"y")==0||strcmp(ch,"Y")==0)
{ printf("\nenter you want delete num ：\n");
printf("num：");
scanf("%s",&c);
for(i=0;i<k;i++)
if(strcmp(c,stu[i].num)==0) break;
for(j=i;j<=2;j++)
stu[j]=stu[j+1];
printf("\t\t\tyou had delete %s\n",c);
k--; }
}
else printf("\nyou enter password is wrong.\n"); }
display();
}
void paixu()
{ struct student temp;
int i,j;
for(i=0;i<k-1;i++)
{
for(j=i+1;j<k;j++)
{
if(stu[i].sum<stu[j].sum)
{
temp=stu[i];
stu[i]=stu[j];
stu[j]=temp;
}
} }
display();
}
void save()
{ FILE *fp; int i;
if((fp=fopen("xinxi.txt","w"))==NULL)
{ printf("cannot write the file.\n");
exit(0);}
for(i=0;strlen(stu[i].num)!=0;i++)
fprintf(fp,"%-10s %-10s %-5s %.2f %.2f %.2f %8f %8f\n",stu[i].num,stu[i].name,stu[i].sex,stu[i].grade[0],stu[i].grade[1],stu[i].grade[2],stu[i].sum,stu[i].v);
fclose(fp);
}
进入修改数据的密码是1234 你有三次机会输入密码
在vc++中调试成功 有问题hi我
❻ 学生成绩管理（C语言）
#include<stdio.h> /*引用库函数*/
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
typedef struct /*定义结构体数组*/
{
char num[10]; /*学号*/
char name[20]; /*姓名*/
int score; /*成绩*/
}Student;
Student stu[80]; /*结构体数组变量*/
int menu_select() /*菜单函数*/
{
char c;
do{
system("cls"); /*运行前清屏*/
printf("\t\t****Students' Grade Management System****\n"); /*菜单选择*/
printf("\t\t | 1. Input Records |\n");
printf("\t\t | 2. Display All Records |\n");
printf("\t\t | 3. Sort |\n");
printf("\t\t | 4. Insert a Record |\n");
printf("\t\t | 5. Delete a Record |\n");
printf("\t\t | 6. Query |\n");
printf("\t\t | 7. Statistic |\n");
printf("\t\t | 8. Add Records from a Text File|\n");
printf("\t\t | 9. Write to a Text file |\n");
printf("\t\t | 0. Quit |\n");
printf("\t\t*****************************************\n");
printf("\t\t\tGive your Choice(0-9):");
c=getchar(); /*读入选择*/
}while(c<'0'||c>'9');
return(c-'0'); /*返回选择*/
}
int Input(Student stud[],int n) /*输入若干条记录*/
{int i=0;
char sign,x[10]; /*x[10]为清除多余的数据所用*/
while(sign!='n'&&sign!='N') /*判断*/
{ printf("\t\t\tstudent's num:"); /*交互输入*/
scanf("\t\t\t%s",stud[n+i].num);
printf("\t\t\tstudent's name:");
scanf("\t\t\t%s",stud[n+i].name);
printf("\t\t\tstudent's score:");
scanf("\t\t\t%d",&stud[n+i].score);
gets(x); /*清除多余的输入*/
printf("\t\t\tany more records?(Y/N)");
scanf("\t\t\t%c",&sign); /*输入判断*/
i++;
}
return(n+i);
}
void Display(Student stud[],int n) /*显示所有记录*/
{
int i;
printf("\t\t\t-----------------------------------\n"); /*格式头*/
printf("\t\t\tnumber name score\n");
printf("\t\t\t-----------------------------------\n");
for(i=1;i<n+1;i++) /*循环输入*/
{
printf("\t\t\t%-16s%-15s%d\n",stud[i-1].num,stud[i-1].name,stud[i-1].score);
if(i>1&&i%10==0) /*每十个暂停*/
{printf("\t\t\t-----------------------------------\n"); /*格式*/
printf("\t\t\t");
system("pause");
printf("\t\t\t-----------------------------------\n");
}
}
printf("\t\t\t");
system("pause");
}
void Sort_by_num(Student stud[],int n) /*按学号排序*/
{ int i,j,*p,*q,s;
char t[10];
for(i=0;i<n-1;i++) /*冒泡法排序*/
for(j=0;j<n-1-i;j++)
if(strcmp(stud[j].num,stud[j+1].num)>0)
{strcpy(t,stud[j+1].num);
strcpy(stud[j+1].num,stud[j].num);
strcpy(stud[j].num,t);
strcpy(t,stud[j+1].name);
strcpy(stud[j+1].name,stud[j].name);
strcpy(stud[j].name,t);
p=&stud[j+1].score;
q=&stud[j].score;
s=*p;
*p=*q;
*q=s;
}
}
int Insert_a_record(Student stud[],int n) /*插入一条记录*/
{char x[10]; /*清除多余输入所用*/
printf("\t\t\tstudent's num:"); /*交互式输入*/
scanf("\t\t\t%s",stud[n].num);
printf("\t\t\tstudent's name:");
scanf("\t\t\t%s",stud[n].name);
printf("\t\t\tstudent's score:");
scanf("\t\t\t%d",&stud[n].score);
gets(x);
n++;
Sort_by_num(stud,n); /*调用排序函数*/
printf("\t\t\tInsert Successed!\n"); /*返回成功信息*/
return(n);
}
int Delete_a_record(Student stud[],int n) /*按姓名查找，删除一条记录*/
{ char s[20];
int i=0,j;
printf("\t\t\ttell me his(her) name:"); /*交互式问寻*/
scanf("%s",s);
while(strcmp(stud[i].name,s)!=0&&i<n) i++; /*查找判断*/
if(i==n)
{ printf("\t\t\tnot find!\n"); /*返回失败信息*/
return(n);
}
for(j=i;j<n-1;j++) /*删除操作*/
{
strcpy(stud[j].num,stud[j+1].num);
strcpy(stud[j].name,stud[j+1].name);
stud[j].score=stud[j+1].score;
}
printf("\t\t\tDelete Successed!\n"); /*返回成功信息*/
return(n-1);
}
void Query_a_record(Student stud[],int n) /*查找并显示一个记录*/
{ char s[20];
int i=0;
printf("\t\t\tinput his(her) name:"); /*交互式输入*/
scanf("\t\t\t%s",s);
while(strcmp(stud[i].name,s)!=0&&i<n) i++; /*查找判断*/
if(i==n)
{ printf("\t\t\tnot find!\n"); /*输入失败信息*/
return;
}
printf("\t\t\this(her) number:%s\n",stud[i].num); /*输出该学生信息*/
printf("\t\t\this(her) score:%d\n",stud[i].score);
}
void Statistic(Student stud[],int n) /*新增功能，输出统计信息*/
{ int i,j=0,k=0,sum=0;
float aver; /*成绩平均值*/
for(i=0;i<n;i++) /*循环输入判断*/
{
sum+=stud[i].score;
if(stud[j].score>stud[i].score) j=i;
if(stud[k].score<stud[i].score) k=i;
}
aver=1.0*sum/n;
printf("\t\t\tthere are %d records.\n",n); /*总共记录数*/
printf("\t\t\tthe hignest score:\n"); /*最高分*/
printf("\t\t\tnumber:%s name:%s score:%d\n",stud[j].num,stud[j].name,stud[j].score);
printf("\t\t\tthe lowest score:\n"); /*最低分*/
printf("\t\t\tnumber:%s name:%s score:%d\n",stud[k].num,stud[k].name,stud[k].score);
printf("\t\t\tthe average score is %5.2f\n",aver); /*平均分*/
}
int AddfromText(Student stud[],int n) /*从文件中读入数据*/
{ int i=0,num;
FILE *fp; /*定义文件指针*/
char filename[20]; /*定义文件名*/
printf("\t\t\tInput the filename:");
scanf("\t\t\t%s",filename); /*输入文件名*/
if((fp=fopen(filename,"rb"))==NULL) /*打开文件*/
{ printf("\t\t\tcann't open the file\n"); /*打开失败信息*/
printf("\t\t\t");
system("pause");
return(n);
}
fscanf(fp,"%d",&num); /*读入总记录量*/
while(i<num) /*循环读入数据*/
{
fscanf(fp,"%s%s%d",stud[n+i].num,stud[n+i].name,&stud[n+i].score);
i++;
}
n+=num;
fclose(fp); /*关闭文件*/
printf("\t\t\tSuccessed!\n");
printf("\t\t\t");
system("pause");
return(n);
}
void WritetoText(Student stud[],int n) /*将所有记录写入文件*/
{
int i=0;
FILE *fp; /*定义文件指针*/
char filename[20]; /*定义文件名*/
printf("\t\t\tWrite Records to a Text File\n"); /*输入文件名*/
printf("\t\t\tInput the filename:");
scanf("\t\t\t%s",filename);
if((fp=fopen(filename,"w"))==NULL) /*打开文件*/
{
printf("\t\t\tcann't open the file\n");
system("pause");
return;
}
fprintf(fp,"%d\n",n); /*循环写入数据*/
while(i<n)
{
fprintf(fp,"%-16s%-15s%d\n",stud[i].num,stud[i].name,stud[i].score);
i++;
}
fclose(fp); /*关闭文件*/
printf("Successed!\n"); /*返回成功信息*/
}
void main() /*主函数*/
{
int n=0;
for(;;)
{
switch(menu_select()) /*选择判断*/
{
case 1:
printf("\t\t\tInput Records\n"); /*输入若干条记录*/
n=Input(stu,n);
break;
case 2:
printf("\t\t\tDisplay All Records\n"); /*显示所有记录*/
Display(stu,n);
break;
case 3:
printf("\t\t\tSort\n");
Sort_by_num(stu,n); /*按学号排序*/
printf("\t\t\tSort Suceessed!\n");
printf("\t\t\t");
system("pause");
break;
case 4:
printf("\t\t\tInsert a Record\n");
n=Insert_a_record(stu,n); /*插入一条记录*/
printf("\t\t\t");
system("pause");
break;
case 5:
printf("\t\t\tDelete a Record\n");
n=Delete_a_record(stu,n); /*按姓名查找，删除一条记录*/
printf("\t\t\t");
system("pause");
break;
case 6:
printf("\t\t\tQuery\n");
Query_a_record(stu,n); /*查找并显示一个记录*/
printf("\t\t\t");
system("pause");
break;
case 7:
printf("\t\t\tStatistic\n");
Statistic(stu,n); /*新增功能，输出统计信息*/
printf("\t\t\t");
system("pause");
break;
case 8:
printf("\t\t\tAdd Records from a Text File\n");
n=AddfromText(stu,n); /*新增功能，输出统计信息*/
break;
case 9:
printf("\t\t\tWrite to a Text file\n");
WritetoText(stu,n); /*循环写入数据*/
printf("\t\t\t");
system("pause");
break;
case 0:
printf("\t\t\tHave a Good Luck,Bye-bye!\n"); /*结束程序*/
printf("\t\t\t");
system("pause");
exit(0);
❼ c语言学生成绩管理
测试过了
/*头文件*/
#include <stdio.h>
#include<dos.h>
#include<stdlib.h> /*其它说明*/
#include<string.h> /*字符串函数*/
#include<memory.h> /*内存操作函数*/
#include<ctype.h> /*字符操作函数*/
#include "conio.h"
#define LEN sizeof(STUDENT)
typedef struct stu /*定义结构体数组用于缓存数据*/
{char num[6];
char name[5];
int score[3];
int sum;
float average;
int order;
struct stu *next;
}STUDENT;
/*函数原型*/
STUDENT *init(); /*初始化函数*/
int menu_select(); /*菜单函数*/
STUDENT *create(); /*创建链表*/
void print(STUDENT *head); /* 显示全部记录*/
void search(STUDENT *head); /*查找记录*/
STUDENT *mydelete(STUDENT *head); /*删除记录*/
STUDENT *sort(STUDENT *head); /*排序*/
STUDENT *insert(STUDENT *head,STUDENT *mynew); /*插入记录*/
void save(STUDENT *head); /*保存文件*/
STUDENT *load(); /*读文件*/
/*主函数界面*/
void main()
{STUDENT *head,mynew;
head=init(); /*链表初始化,使head的值为NULL*/
for(;;) /*循环无限次*/
{switch(menu_select())
{
case 1:head=create();break;
case 2:print(head);break;
case 3:search(head);break;
case 4:head=mydelete(head);break;
case 5:head=sort(head);break;
case 6:head=insert(head,&mynew);break; /*&mynew表示返回地址*/
case 7:save(head);break;
case 8:head=load(); break;
case 9:exit(0); /*如菜单返回值为9则程序结束*/
}
}
}
/*初始化函数*/
STUDENT *init()
{
return NULL; /*返回空指针*/
}
/*菜单选择函数*/
menu_select()
{int n;
printf("\n按任一键进入主菜单...... \npress any key to enter the menu......"); /*按任一键进入主菜单*/
getch(); /*从键盘读取一个字符,但不显示于屏幕*/
system("cls");
printf("********************************************************************************\n");
printf("\t\t 欢迎 Welcome to\n");
printf("\n\t\t\t 使用学生管理系统1.0\n\n\t\t\t\t\t\n");
printf("*************************************MENU***************************************\n");
printf("\t\t\t1. 输入学生成绩记录 Enter the record\n"); /*输入学生成绩记录*/
printf("\t\t\t2. 显示 Print the record\n"); /*显示*/
printf("\t\t\t3. 寻找 Search record on name\n"); /*寻找*/
printf("\t\t\t4. 删除 mydelete a record\n"); /*删除*/
printf("\t\t\t5. 排序 Sort to make mynew a file\n"); /*排序*/
printf("\t\t\t6. 插入 Insert record to list\n"); /*插入*/
printf("\t\t\t7. 保存 Save the file\n"); /*保存*/
printf("\t\t\t8. 读取 Load the file\n"); /*读取*/
printf("\t\t\t9. 退出 Quit\n"); /*退出*/
printf("********************************************************************************\n");
do{
printf("\n\t\t\t输入你的选择Enter your choice(1~9):");
scanf("%d",&n);
}while(n<1||n>9); /*如果选择项不在1~9之间则重输*/
return(n); /*返回选择项，主函数根据该数调用相应的函数*/
}
/*输入函数*/
STUDENT *create()
{int i,s;
STUDENT *head=NULL,*p; /* 定义函数.此函数带回一个指向链表头的指针*/
system("cls");
for(;;)
{p=(STUDENT *)malloc(LEN); /*开辟一个新的单元*/
if(!p) /*如果指针p为空*/
{printf("\n输出内存溢出. Out of memory."); /*输出内存溢出*/
return (head); /*返回头指针,下同*/
}
printf("输入学号Enter the num(0:list end):");
scanf("%s",p->num);
if(p->num[0]=='0') break; /*如果学号首字符为0则结束输入*/
printf("输入名字Enter the name:");
scanf("%s",p->name);
printf("请输入3门成绩Please enter the %d scores\n",3); /*提示开始输入成绩*/
s=0; /*计算每个学生的总分，初值为0*/
for(i=0;i<3;i++) /*3门课程循环3次*/
{
do{
printf("成绩score%d:",i+1);
scanf("%d",&p->score[i]);
if(p->score[i]<0 || p->score[i]>100) /*确保成绩在0~100之间*/
printf("数据错误,请重新输入 Data error,please enter again.\n");
}while(p->score[i]<0 || p->score[i]>100);
s=s+p->score[i]; /*累加各门成绩*/
}
p->sum=s; /*将总分保存*/
p->average=(float)s/3; /*先用强制类型转换将s转换成float型,再求平均值*/
p->order=0; /*未排序前此值为0*/
p->next=head; /*将头结点做为新输入结点的后继结点*/
head=p; /*新输入结点为新的头结点*/
}
return(head);
}
/* 显示全部记录函数*/
void print(STUDENT *head)
{int i=0; /* 统计记录条数*/
STUDENT *p; /*移动指针*/
system("cls");
p=head; /*初值为头指针*/
printf("\n************************************STUDENT************************************\n");
printf("-------------------------------------------------------------------------------\n");
printf("| Rec | Num | Name | Sc1 | Sc2 | Sc3 | Sum | Ave | Order |\n");
printf("-------------------------------------------------------------------------------\n");
while(p!=NULL)
{
i++;
printf("| %3d | %4s | %-4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n",
i, p->num,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order);
p=p->next;
}
printf("-------------------------------------------------------------------------------\n");
printf("**************************************END**************************************\n");
}
/*查找记录函数*/
void search(STUDENT *head)
{STUDENT *p; /* 移动指针*/
char s[5]; /*存放姓名用的字符数组*/
system("cls");
printf("请输入个姓名来查找. Please enter name for searching.\n");
scanf("%s",s);
p=head; /*将头指针赋给p*/
while(strcmp(p->name,s) && p != NULL) /*当记录的姓名不是要找的，或指针不为空时*/
p=p->next; /*移动指针，指向下一结点*/
if(p!=NULL) /*如果指针不为空*/
{printf("\n*************************************FOUND************************************\n");
printf("-------------------------------------------------------------------------------\n");
printf("| Num | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n");
printf("-------------------------------------------------------------------------------\n");
printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n",
p->num,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order);
printf("-------------------------------------------------------------------------------\n");
printf("***************************************END**************************************\n");
}
else
printf("\n没有该学生 There is no num %s student on the list.\n",s); /*显示没有该学生*/
}
/*删除记录函数*/
STUDENT *mydelete(STUDENT *head)
{int n;
STUDENT *p1,*p2; /*p1为查找到要删除的结点指针，p2为其前驱指针*/
char c,s[6]; /*s[6]用来存放学号,c用来输入字母*/
system("cls");
printf("请输入要删除的学号 Please enter the mydeleted num: ");
scanf("%s",s);
p1=p2=head; /*给p1和p2赋初值头指针*/
while(strcmp(p1->num,s) && p1 != NULL) /*当记录的学号不是要找的，或指针不为空时*/
{p2=p1; /*将p1指针值赋给p2作为p1的前驱指针*/
p1=p1->next; /*将p1指针指向下一条记录*/
}
if(strcmp(p1->num,s)==0) /*学号找到了*/
{printf("**************************************FOUND************************************\n");
printf("-------------------------------------------------------------------------------\n");
printf("| Num | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n");
printf("-------------------------------------------------------------------------------\n");
printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n",
p1->num,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->sum,p1->average,p1->order);
printf("-------------------------------------------------------------------------------\n");
printf("***************************************END**************************************\n");
printf("\n是否要删除,输入Y删除,N则退出\nAre you sure to mydelete the student Y/N ?"); /*提示是否要删除,输入Y删除,N则退出*/
for(;;)
{scanf("%c",&c);
if(c=='n'||c=='N') break; /*如果不删除,则跳出本循环*/
if(c=='y'||c=='Y')
{
if(p1==head) /*若p1==head，说明被删结点是首结点*/
head=p1->next; /*把第二个结点地址赋予head*/
else
p2->next=p1->next; /*否则将一下结点地址赋给前一结点地址*/
n=n-1;
printf("\n学号为(Num): %s 学生以被删除(student have been mydeleted.)\n",s);
printf("别忘了保存. Don't forget to save.\n");break; /*删除后就跳出循环*/
}
}
}
else
printf("\n没有这个学生在表上\nThere is no num %s student on the list.\n",s); /*找不到该结点*/
return(head);
}
/*排序函数*/
STUDENT *sort(STUDENT *head)
{int i=0; /*保存名次*/
STUDENT *p1,*p2,*t,*temp; /*定义临时指针*/
temp=head->next; /*将原表的头指针所指的下一个结点作头指针*/
head->next=NULL; /*第一个结点为新表的头结点*/
while(temp!=NULL) /*当原表不为空时，进行排序*/
{
t=temp; /*取原表的头结点*/
temp=temp->next; /*原表头结点指针后移*/
p1=head; /*设定移动指针p1，从头指针开始*/
p2=head; /*设定移动指针p2做为p1的前驱，初值为头指针*/
while(t->average<p1->average&&p1!=NULL) /*作成绩平均分比较*/
{
p2=p1; /*待排序点值小，则新表指针后移*/
p1=p1->next;
}
if(p1==p2) /*p1==p2，说明待排序点值大，应排在首位*/
{
t->next=p1; /*待排序点的后继为p*/
head=t; /*新头结点为待排序点*/
}
else /*待排序点应插入在中间某个位置p2和p1之间，如p为空则是尾部*/
{
t->next=p1; /*t的后继是p1*/
p2->next=t; /*p2的后继是t*/
}
}
p1=head; /*已排好序的头指针赋给p1，准备填写名次*/
while(p1!=NULL) /*当p1不为空时，进行下列操作*/
{
i++; /*结点序号*/
p1->order=i; /*将结点序号赋值给名次*/
p1=p1->next; /*指针后移*/
}
printf("排序成功 Sorting is sucessful.\n"); /*排序成功*/
return (head);
}
/*插入记录函数*/
STUDENT *insert(STUDENT *head,STUDENT *mynew)
{STUDENT *p0,*p1,*p2;
int n,sum1,i;
p1=head; /*使p1指向第一个结点*/
p0=mynew; /*p0指向要插入的结点*/
printf("\nPlease enter a mynew record.\n"); /*提示输入记录信息*/
printf("输入学号Enter the num:");
scanf("%s",mynew->num);
printf("输入名字Enter the name:");
scanf("%s",mynew->name);
printf("Please enter the %d scores.\n",3);
sum1=0; /*保存新记录的总分，初值为0*/
for(i=0;i<3;i++)
{
do{
printf("成绩score%d:",i+1);
scanf("%d",&mynew->score[i]);
if(mynew->score[i]>100||mynew->score[i]<0)
printf("数据错误Data error,please enter again.\n");
}while(mynew->score[i]>100||mynew->score[i]<0);
sum1=sum1+mynew->score[i]; /*累加各门成绩*/
}
mynew->sum=sum1; /*将总分存入新记录中*/
mynew->average=(float)sum1/3;
mynew->order=0;
if(head==NULL) /*原来的链表是空表*/
{head=p0;p0->next=NULL;} /*使p0指向的结点作为头结点*/
else
{while((p0->average<p1->average)&&(p1->next!=NULL))
{p2=p1; /*使p2指向刚才p1指向的结点*/
p1=p1->next; /*p1后移一个结点*/
}
if(p0->average>=p1->average)
{if(head==p1)head=p0; /*插到原来第一个结点之前*/
else p2->next=p0; /*插到p2指向的结点之后*/
p0->next=p1;}
else
{p1->next=p0;p0->next=NULL;} /*插到最后的结点之后*/
}
n=n+1; /*结点数加1*/
head=sort(head); /*调用排序的函数,将学生成绩重新排序*/
printf("\n学生Student %s 已被更新have been inserted.\n",mynew->name);
printf("不要忘了保存Don't forget to save the mynew file.\n");
return(head);
}
/*保存数据到文件函数*/
void save(STUDENT *head)
{FILE *fp; /*定义指向文件的指针*/
STUDENT *p; /* 定义移动指针*/
char outfile[10];
printf("输出文件例如:c:\\score Enter outfile name,for example c:\\score\n");
scanf("%s",outfile);
if((fp=fopen(outfile,"w"))==NULL) /*为输出打开一个二进制文件,为只写方式*/
{
printf("打不开文件Cannot open the file\n");
return; /*若打不开则返回菜单*/
}
printf("\n保存中...Saving the file......\n");
p=head; /*移动指针从头指针开始*/
while(p!=NULL) /*如p不为空*/
{
fwrite(p,LEN,1,fp); /*写入一条记录*/
p=p->next; /*指针后移*/
}
fclose(fp); /*关闭文件*/
printf("保存成功....Save the file successfully!\n");
}
/* 从文件读数据函数*/
STUDENT *load()
{STUDENT *p1,*p2,*head=NULL; /*定义记录指针变量*/
FILE *fp; /* 定义指向文件的指针*/
char infile[10];
printf("倒入文件例如:c:\\score Enter infile name,for example c:\\score\n");
scanf("%s",infile);
if((fp=fopen(infile,"r"))==NULL) /*打开一个二进制文件，为只读方式*/
{
printf("打不开文件Can not open the file.\n");
return(head);
}
printf("\n寻找文件...Loading the file!\n");
p1=(STUDENT *)malloc(LEN); /*开辟一个新单元*/
if(!p1)
{
printf("内存溢出!Out of memory!\n");
return(head);
}
head=p1; /*申请到空间，将其作为头指针*/
while(!feof(fp)) /*循环读数据直到文件尾结束*/
{
if(fread(p1,LEN,1,fp)!=1) break; /*如果没读到数据，跳出循环*/
p1->next=(STUDENT *)malloc(LEN); /*为下一个结点开辟空间*/
if(!p1->next)
{
printf("Out of memory!\n");
return (head);
}
p2=p1; /*使p2指向刚才p1指向的结点*/
p1=p1->next; /*指针后移，新读入数据链到当前表尾*/
}
p2->next=NULL; /*最后一个结点的后继指针为空*/
fclose(fp);
printf("\n你成功的从文件中读取了数据!\nYou have success to read data from the file!\n");
return (head);
}
❽ C语言建立一个“学生管理成绩系统”
#include<stdio.h>
#include<malloc.h>
#include<string.h>
#include<conio.h>
#include<windows.h>
struct student//初始化结构体 包括学生学号和成绩
{
char num[20];
float chengji;
struct student*next;
};
float p;
struct student* luru()//建立链表 录入学生信息
{
int i;
student *head,*p1,*p2;
printf("录入数据\n");
p1=head=(struct student*)malloc(sizeof(struct student));
p1->next=NULL;
for(i=0;i<10;i++)
{
system("cls");
printf("请输入第%d个学生的数据\n",i+1);
p2=(struct student*)malloc(sizeof(struct student));
printf("\n请输入学生学号：");
scanf("%s",p2->num);
printf("\n请输入学生成绩：");
scanf("%f",&p2->chengji);
p1->next=p2;
p2->next=NULL;
p1=p1->next;
}
printf("录入成功！\n");
return head;
}
void shuchu(student *head)//输出所有录入的信息
{
student *p1;
int i;
printf("输出信息\n");
p1=head->next;
printf("学号\t\t\t成绩\n");
for(i=0;i<10;i++)
{
printf("%s\t\t",p1->num);
printf("%f\n",p1->chengji);
p1=p1->next;
}
printf("输出完毕！\n");
}
void bijiao(student*head)//计算10个学生成绩的平均分、最高分和最低分。
{
int i;
float max,min,sum=0;
student *p1;
printf("求平均值 最大 最小\n");
p1=head->next;;
max=min=p1->chengji;
for(i=0;i<10;i++)
{
if(p1->chengji>max)
{
max=p1->chengji;
}
if(p1->chengji<min)
{
min=p1->chengji;
}
sum+=p1->chengji;
p1=p1->next;
}
printf("最高成绩是%f最低成绩是%f平均成绩是%f\n",max,min,sum/10);
p=sum/10;
}
void paixu(student *head)//对成绩由低到高进行排序（使用冒泡法），并输出排序后成绩
{
student*p1;
float n;
float a[10];
int i;
int j;
printf("从小到大排序 输出成绩\n");
p1=head->next;
for(i=0;i<10;i++)
{
a[i]=p1->chengji;
p1=p1->next;
}
for(i=0;i<9;i++)
{
for(j=0;j<9-i;j++)
{
if(a[j]>a[j+1])
{
n=a[j];
a[j]=a[j+1];
a[j+1]=n;
}
}
}
for(i=0;i<10;i++)
{
printf("%f\t",a[i]);
}
}
void pingji(student*head)// 根据学生的成绩评定等级，规定如下：0—59分为不及格，60—69分为及格，70—79为良好，80—100分为优秀。
{
int i;
student *p1;
printf("按成绩评级\n");
p1=head->next;
for(i=0;i<10;i++)
{
if(p1->chengji<60)
{
printf("%s不及格\n",&p1->num);
}
if(p1->chengji<70&&p1->chengji>=60)
{
printf("%s及格\n",&p1->num);
}
if(p1->chengji<80&&p1->chengji>=70)
{
printf("%s良好\n",&p1->num);
}
if(p1->chengji<=100&&p1->chengji>=80)
{
printf("%s优秀\n",&p1->num);
}
p1=p1->next;
}
}
void tongji(student*head)//统计高于平均分的学生人数，并打印学号。
{
student *p1;
int i,j=0;
printf("如下学生成绩高于平均分\n");
p1=head->next;
for(i=0;i<10;i++)
{
if(p1->chengji>p)
{
printf("%s\n",&p1->num);
j++;
}
}
printf("共%d个学生高于平均成绩\n",j);
}
void chaxun(student*head)// 根据学号进行学生成绩查询。
{
student *p1;
int i,j,n;
char id[20];
for(;;)
{
system("cls");
p1=head->next;
j=0;
printf("请输入要查询的学号：");
scanf("%s",&id);
for(i=0;i<10;i++)
{
if(strcmp(p1->num,id)==0)
{
printf("%f\n",p1->chengji);
j=1;
break;
}
p1=p1->next;
}
if(j==0)
{
printf("查无此人");
}
printf("按0退出 否则继续查询");
scanf("%d",&n);
if(n==0)
break;
}
}
void main()
{
student *head;
head=luru();
getch();
shuchu(head);
getch();
bijiao(head);
getch();
paixu(head);
getch();
pingji(head);
getch();
tongji(head);
getch();
chaxun(head);
}
你试试吧 有问题 我再帮你改
❾ c语言中学生成绩管理的问题
#include
#include
#include
struct STUDENT{
float score[3];
long id;
char names[20];
};
typedef struct STUDENT student;//simplify the struct STUDENT
typedef struct STUDENT *Pstudent;
void print();
void append();
void course_total();
void student_total();
void score_sort(int (*compare)(float a,float b));
void number_sort();
void name_sort(Pstudent names_[30]);
void number_search();
void name_search();
void statistic(Pstudent scores_[30]);
void show(int i);
int ascend(float a, float b){
if(a>b) return 1;
else return 0;
}
int descend(float a, float b){
if(a<b) return 1;
else return 0;
}
int n;//the number of students
int flg=1;//true print the result
student *stuArray[30];//the global variable can simplify the compute
int again=1;//whether to continue
int main(){
int i;
printf("Input student number(n<30):");
scanf("%d",&n);
int choice;
while(again){
print();
scanf("%d",&choice);
switch(choice){
case 1:
append();
break;
case 2:
course_total();//use flag to define whether to print
break;
case 3:
student_total();
break;
case 4:
score_sort(descend);
if(flg){
printf("Sort in descending order by total score of every student:\n");
printf("NO\tName\tMT\tEN\tPH\tSUM\tAVER\n");
for(i=0;i<n;i++)
show(i);
}
break;
case 5:
score_sort(descend);
if(flg){
printf("Sort in ascending order by total score of every student:\n");
printf("NO\tName\tMT\tEN\tPH\tSUM\tAVER\n");
for(i=0;i<n;i++)
show(n-1-i);
}
break;
case 6:
number_sort();
break;
case 7:
name_sort(stuArray);
break;
case 8:
number_search();
break;
case 9:
name_search();
break;
case 10:
statistic(stuArray);
break;
case 0:
again=0;
printf("End of program!\n");
break;
default:
printf("Input error!\n");
break;
}
}
return 0;
}
void print(){
printf("1.Append record\n");
printf("2.Calculate total and average score of every course\n");
printf("3.Calculate total and average score of every student\n");
printf("4.Sort in descending order by total score of every student\n");
printf("5.Sort in ascending order by total score of every student\n");
printf("6.Sort in ascending order by number\n");
printf("7.Sort in dictionary order by name\n");
printf("8.Search by number\n");
printf("9.Search by name\n");
printf("10.Statistic analysis\n");
printf("Please Input your choice:");
}
void append(){
int i;
printf("Input student's ID,name and score:\n");
for(i=0;i<n;i++){////the most significant part malloc the memory when appending record
stuArray[i] = (student *)malloc(sizeof(student));
scanf("%ld%s",&stuArray[i]->id,stuArray[i]->names);
scanf("%f",&stuArray[i]->score[0]);
scanf("%f",&stuArray[i]->score[1]);
scanf("%f",&stuArray[i]->score[2]);
}
}
void course_total(){
int i;
float sum0=0.0,sum1=0.0,sum2=0.0;
for(i=0;i<n;i++){
sum0+=stuArray[i]->score[0];
sum1+=stuArray[i]->score[1];
sum2+=stuArray[i]->score[2];
}
if(flg){
printf("course %d:sum=%.0f,aver=%.0f\n",1,sum0,sum0/n);
printf("course %d:sum=%.0f,aver=%.0f\n",2,sum1,sum1/n);
printf("course %d:sum=%.0f,aver=%.0f\n",3,sum2,sum2/n);
}
}
void student_total(){
float total[30]={0.0};
int i;
for(i=0;i<n;i++){
total[i]=stuArray[i]->score[0]+stuArray[i]->score[1]+stuArray[i]->score[2];
}
if(flg){
for(i=0;i<n;i++)
printf("student %d:sum=%.0f,aver=%.0f\n",i+1,total[i],total[i]/3);
}
}
void score_sort(int (*compare)(float a,float b)){
int i,j;
float total[30]={0.0};
for(i=0;i<n;i++){
total[i]=stuArray[i]->score[0]+stuArray[i]->score[1]+stuArray[i]->score[2];
}
for(i=0;i<n;i++){
for(j=0;j<=i;j++)
//if((*compare)(stuArray[i]->score[0]+stuArray[i]->score[1]+stuArray[i]->score[2],stuArray[j]->score[0]+stuArray[j]->score[1]+stuArray[j]->score[2])==0){
if((*compare)(total[i],total[j])==0){//just swap the pointer it simplify the program
student *tmp=(student *)malloc(sizeof(student));
memcpy(tmp,stuArray[i],sizeof(student));
memcpy(stuArray[i],stuArray[j],sizeof(student));
memcpy(stuArray[j],tmp,sizeof(student));
}//memcpy-> the hole the memory
}
}
void number_sort(){//没必要传参
int i,j;
for(i=0;i<n;i++){
for(j=0;j<i;j++)
if(stuArray[i]->idid){
student *tmp=(student *)malloc(sizeof(student));
memcpy(tmp,stuArray[i],sizeof(student));
memcpy(stuArray[i],stuArray[j],sizeof(student));
memcpy(stuArray[j],tmp,sizeof(student));
}
}
if(flg){
printf("Sort in ascending order by number:\n");
printf("NO\tName\tMT\tEN\tPH\tSUM\tAVER\n");
for(i=0;i<n;i++)
show(i);
}
}
void name_sort(Pstudent names_[30]){
int i,j;
for(i=0;i<n;i++){
for(j=0;j<=i;j++)
if(strcmp(names_[i]->names,names_[j]->names)<0){
student *tmp=(student *)malloc(sizeof(student));
memcpy(tmp,stuArray[i],sizeof(student));
memcpy(stuArray[i],stuArray[j],sizeof(student));
memcpy(stuArray[j],tmp,sizeof(student));
}
}
if(flg){
printf("Sort in dictionary order by name:\n");
printf("NO\tName\tMT\tEN\tPH\tSUM\tAVER\n");
for(i=0;i<n;i++)
show(i);
}
}
void number_search(){
long query;
printf("Input the number you want to search:");
scanf(" %ld",&query);
int i;
score_sort(descend);//100 98 87
for(i=0;i<n;i++){
if(stuArray[i]->id==query)
break;
}
if(i!=n){
printf("%d\t",i+1);
show(i);
}
else
printf("Not found!\n");
}
void name_search(){
char query[20];
score_sort(descend);
printf("Input the name you want to search:");
scanf("%s",query);
int i;
for(i=0;i<n;i++){
if(!strcmp(query,stuArray[i]->names)){
break;
}
}
if(i!=n){
printf("%d\t",i+1);
show(i);
}
else
printf("Not found!\n");
}
void statistic(Pstudent scores_[30]){//a pointer array stands for scores
float MT[30],EN[30],PH[30];
int i;
for(i=0;i<n;i++){
MT[i]=scores_[i]->score[0];
EN[i]=scores_[i]->score[1];
PH[i]=scores_[i]->score[2];
}
int sta[6]={0};//means the statistic of every student (<60 or 60-70 ....)
for(i=0;i<n;i++){
if(MT[i]<60)
sta[0]++;
if(MT[i]==100)
sta[5]++;
if(MT[i]>=60&&MT[i]<=69)
sta[1]++;
if(MT[i]>=70&&MT[i]<=79)
sta[2]++;
if(MT[i]>=80&&MT[i]<=89)
sta[3]++;
if(MT[i]>=90&&MT[i]<=100)
sta[4]++;
}
if(flg){
printf("For course %d:\n",1);
printf("<60\t%d\t%.2f%%\n",sta[0],sta[0]/(float)n*100);//change n to float
printf("60-69\t%d\t%.2f%%\n",sta[1],sta[1]/(float)n*100);
printf("70-79\t%d\t%.2f%%\n",sta[2],sta[2]/(float)n*100);
printf("80-89\t%d\t%.2f%%\n",sta[3],sta[3]/(float)n*100);
printf("90-100\t%d\t%.2f%%\n",sta[4],sta[4]/(float)n*100);
printf("100\t%d\t%.2f%%\n",sta[5],sta[5]/(float)n*100);
}
memset(sta,0,6*sizeof(int));//initialize the sta array
for(i=0;i<n;i++){
if(EN[i]<60)
sta[0]++;
if(EN[i]==100)
sta[5]++;
if(EN[i]>=60&&EN[i]<=69)
sta[1]++;
if(EN[i]>=70&&EN[i]<=79)
sta[2]++;
if(EN[i]>=80&&EN[i]<=89)
sta[3]++;
if(EN[i]>=90&&EN[i]<=100)
sta[4]++;
}
if(flg){
printf("For course %d:\n",2);
printf("<60\t%d\t%.2f%%\n",sta[0],sta[0]/(float)n*100);//change n to float
printf("60-69\t%d\t%.2f%%\n",sta[1],sta[1]/(float)n*100);
printf("70-79\t%d\t%.2f%%\n",sta[2],sta[2]/(float)n*100);
printf("80-89\t%d\t%.2f%%\n",sta[3],sta[3]/(float)n*100);
printf("90-100\t%d\t%.2f%%\n",sta[4],sta[4]/(float)n*100);
printf("100\t%d\t%.2f%%\n",sta[5],sta[5]/(float)n*100);
}
memset(sta,0,6*sizeof(int));
for(i=0;i<n;i++){
if(PH[i]<60)
sta[0]++;
if(PH[i]==100)
sta[5]++;
if(PH[i]>=60&&PH[i]<=69)
sta[1]++;
if(PH[i]>=70&&PH[i]<=79)
sta[2]++;
if(PH[i]>=80&&PH[i]<=89)
sta[3]++;
if(PH[i]>=90&&PH[i]<=100)
sta[4]++;
}
if(flg){
printf("For course %d:\n",3);
printf("<60\t%d\t%.2f%%\n",sta[0],sta[0]/(float)n*100);//change n to float
printf("60-69\t%d\t%.2f%%\n",sta[1],sta[1]/(float)n*100);
printf("70-79\t%d\t%.2f%%\n",sta[2],sta[2]/(float)n*100);
printf("80-89\t%d\t%.2f%%\n",sta[3],sta[3]/(float)n*100);
printf("90-100\t%d\t%.2f%%\n",sta[4],sta[4]/(float)n*100);
printf("100\t%d\t%.2f%%\n",sta[5],sta[5]/(float)n*100);
}
}
void show(int i){
printf("%ld\t%s\t",stuArray[i]->id,stuArray[i]->names);//order is the id after sort
printf("%.0f\t%.0f\t%.0f\t",stuArray[i]->score[0],stuArray[i]->score[1],stuArray[i]->score[2]);
float sum=stuArray[i]->score[0]+stuArray[i]->score[1]+stuArray[i]->score[2];
printf("%.0f\t%.0f\n",sum,sum/3);
}