C學生成績管理

『壹』 用C語言設計一個學生成績管理系統

#include <stdio.h>
#include <string.h>

#include <stdlib.h>
#defineMAX1000

/*定義學生成績信息結構*/
struct stu
{

char id[8];
char name[8];

(1)C學生成績管理擴展閱讀：

short：修飾int，短整型數據，可省略被修飾的int。（K&R時期引入）

long：修飾int，長整型數據，可省略被修飾的int。（K&R時期引入）

long long：修飾int，超長整型數據，可省略被修飾的int。（C99標准新增）

signed：修飾整型數據，有符號數據類型。（C89標准新增）

unsigned：修飾整型數據，無符號數據類型。（K&R時期引入）

restrict:用於限定和約束指針，並表明指針是訪問一個數據對象的唯一且初始的方式。（C99標准新增）

復雜類型關鍵字

struct：結構體聲明。（K&R時期引入）

union：聯合體聲明。（K&R時期引入）

enum：枚舉聲明。（C89標准新增）

typedef：聲明類型別名。（K&R時期引入）

sizeof：得到特定類型或特定類型變數的大小。（K&R時期引入）

inline:內聯函數用於取代宏定義，會在任何調用它的地方展開。（C99標准新增）

『貳』 c語言 學生成績管理程序

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct stu
{
int num;//編號
char name[30];//姓名
char fm[30];//性別
char tel[30];//電話號碼
char dz[30];//地址
int cj;//成績
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("---------------歡迎使用通訊錄----------------------\n");
do
{
printf("學號:%d\n",i+1);
u[i].num=i+1;
printf("姓名:\n");
scanf("%s",u[i].name);
printf("性別:\n");
scanf("%s",u[i].fm);
printf("電話號碼:\n");
scanf("%s",u[i].tel);
printf("地址:\n");
scanf("%s",u[i].dz);
printf("成績:\n");
scanf("%d",&u[i].cj);
i++;
printf("是否繼續輸入?(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
do
{

printf("〓 通訊錄 〓\n");
printf("〓 0.退 出 〓\n");
printf("〓 1.查 找 〓\n");
printf("〓 2.添 加 〓\n");
printf("〓 3.刪 除 〓\n");
printf("〓 4.修 改 〓\n");
printf("〓 5.瀏覽信息 〓\n");
printf("〓 6.成績排名 〓\n");
printf("〓〓〓〓〓〓〓〓〓〓〓〓〓\n");
printf("請選擇:\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("是否選擇其它功能(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
}
void ss1(struct stu u[])
{
char name[20];
int j;
printf("請輸入您要查找的姓名");
scanf("%s",name);
for(j=0;j<i;j++)
{
if(strcmp(u[j].name,name)==0)
break;
}
if(j==i)
printf("查無此人");
else
printf("學號:%d 姓名:%s 電話號碼%s 地址%s 成績%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("學號:%d\n",z+1);
u[i].num=z+1;
printf("姓名:\n");
scanf("%s",u[i].name);
printf("性別:\n");
scanf("%s",u[i].fm);
printf("電話號碼\n");
scanf("%s",u[i].tel);
printf("地址:\n");
scanf("%s",u[i].dz);
printf("成績:\n");
scanf("%d",&u[i].cj);
z++;
i++;
printf("是否繼續輸入?(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
}

void ss3(struct stu u[])
{
int j,k,num;
printf("請輸入您要刪除的學號");
scanf("%d",&num);
for(j=0;j<i;j++)
{
if(u[j].num==num)
break;
}
if(j==i)
printf("查無此人");
else
{
for(k=j;k<i-1;k++)
{
u[k]=u[k+1];
}
z=i;
i--;
printf("---------------------刪除成功---------------------\n");
}

}
void ss4(struct stu u[])
{
int num,j,k;
char m;
printf("請選擇您要修改的學號:");
scanf("%d",&num);
for(j=0;j<i;j++)
{
if(u[j].num==num)
break;
}
if(j==i)
printf("查無此人");
else
{
do
{
printf("學號:%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("性別:\n");
scanf("%s",u[i].fm);
printf("電話號碼\n");
scanf("%s",u[i].tel);
printf("地址:\n");
scanf("%s",u[i].dz);
printf("成績:\n");
scanf("%d",&u[i].cj);
i++;
printf("-----------------------修改完畢-----------------------\n");
printf("是否繼續輸入?(y\\n)");
scanf(" %c",&m);
}while(m=='Y'||m=='y');
}
}

void ss5(struct stu u[])
{
int j;
for(j=0;j<i;j++)
{
printf("學號:%d 姓名:%s 電話號碼%s 地址%s 成績%d\n",u[j].num,u[j].name,u[j].tel,u[j].dz,u[j].cj);
}
if(i==0)
{
printf("當前沒有信息");
}

}
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學號:%d 姓名:%s 電話號碼%s 地址%s 成績%d\n",sum+1,u[j].num,u[j].name,u[j].tel,u[j].dz,u[j].cj);
sum++;
}
}

『叄』 學生成績管理系統（用C語言編程）

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define t 100
void fun(struct student *s);
void fun1(struct student *s);
void fun2(struct student *s);
void fun3(struct student *s);
void fun4(struct student *s);
void fun5(struct student *s);
void fun6(struct student *s);
struct student
{
char no[20];
char name[20];
char spec[20];
int grade;
char sex[20];
};
void main()
{
struct student s[t]={{"10001","zhang","chinese",12,"male"},
{"10002","wang","math",13,"fale"},
{"10003","lisi","chemsi",12,"male"},
{"10004","ma","english",13,"fale"},
{"10005","kuko","math",14,"male"}};

fun(s);
}
void fun(struct student *s)
{
int n;
printf("\n\n\t\t學生檔案管理系統");
printf("\n\n\t----------------------------------------");
printf("\n\n\t\t1：錄入學生信息系統");
printf("\n\n\t\t2：修改學生信息系統");
printf("\n\n\t\t3：刪除學生信息系統");
printf("\n\n\t\t4：查詢學生信息系統");
printf("\n\n\t\t5：輸出學生信息系統");
printf("\n\n\t\t6：退出系統");
printf("\n\n\t----------------------------------------");
printf("\n\n請選擇你要的服務（按數字1~6進入）：");
scanf("%d",&n);
system("cls");
if(n==1)
{
printf("\n\n\t\t歡迎進入錄入學生系統");
fun1(s);
}
else if(n==2)
{
printf("\n\n\t\t歡迎進入修改學生系統");
fun5(s);
}
else if(n==3)
{
printf("\n\n\t\t歡迎進入刪除學生系統");
fun6(s);
}
else if(n==4)
{
printf("\n\n\t\t歡迎進入查詢學生系統");
printf("\n\n\t----------------------------------------");
printf("\n\n\t\t1：按學號查詢學生信息系統");
printf("\n\n\t\t2：按班級查詢學生信息系統");
printf("\n\n\t----------------------------------------");
printf("\n\n請選擇你要的服務（按數字1~2進入）：");
scanf("%d",&n);
system("cls");
if(n==1)
{
printf("\n\n\t\t1：按學號查詢學生信息系統");
fun2(s);
}
else if(n==2)
{
printf("\n\n\t\t1：按班級查詢學生信息系統");
fun3(s);
}
else
{
printf("\n\n\t\t數據錯誤");
}
}
else if(n==5)
{
printf("\n\n\t\t歡迎進入輸出學生系統");
fun4(s);

} else if(n==6)
{
printf("\n\n\t\t謝謝使用學生管理系統！\n");
printf("\n\n\t\t請雙擊Enter鍵退出系統:");
getchar();
getchar();
exit(0);
}
else
printf("\n\n\t\t數據錯誤");
}
void fun1(struct student *s)
{
int n,i;
char d;
printf("\n\n\t請輸入學生的數量:");
scanf("%d",&n);
for(i=5;i<n+5;i++)
{
printf("\n\t\t請輸入學生學號：");
scanf("%s",s[i].no);
printf("\n\t\t請輸入學生姓名：");
scanf("%s",s[i].name);
printf("\n\t\t請輸入學生專業：");
scanf("%s",s[i].spec);
printf("\n\t\t請輸入學生年級：");
scanf("%d",&s[i].grade);
printf("\n\t\t請輸入學生性別：");
scanf("%s",s[i].sex);
getchar('\n');
system("cls");
}
printf("\n\n\t\t學號\t姓名\t專業\t年級\t性別");
printf("\n\t---------------------------------------------------");
for(i=0;i<n+5;i++)
{
printf("\n\n\t\t%-8s%-8s%-8s%-8d%-8s",s[i].no,s[i].name,s[i].spec,s[i].grade,s[i].sex);
}
printf("\n\t---------------------------------------------------\n");
printf("返回首頁（請按任意鍵）：");
scanf("%c",&d);
system("cls");
fun(s);
}
void fun2(struct student *s)
{
char a[20],d;
int i;
printf("\n\n\t請輸入要查詢學生的學號(10001~10005)：");
scanf("%s",a);
for(i=0;i<5;i++)
{
if(!strcmp(s[i].no,a))
{
printf("\n\t此學生的信息：");
printf("\n\n\t\t學號\t姓名\t專業\t年級\t性別");
printf("\n\t---------------------------------------------------");
printf("\n\n\t\t%-8s%-8s%-8s%-8d%-8s\n",s[i].no,s[i].name,s[i].spec,s[i].grade,s[i].sex);
printf("\n\t---------------------------------------------------");
}

if(i==4&&s[i].no!="10005")
{
printf("\n\t\t查無此人！");

}
}
printf("\n\n返回首頁（請按任意鍵）：");
getchar();
scanf("%c",&d);
system("cls");
fun(s);
}
void fun3(struct student *s)
{
int i,a;
char d;
printf("\n\n\t請輸入要查詢學生的班級(12~14)：");
scanf("%d",&a);
for(i=0;i<5;i++)
{
if(a==s[i].grade)
{
printf("\n\t此學生的信息：");
printf("\n\n\t\t學號\t姓名\t專業\t年級\t性別");
printf("\n\t---------------------------------------------------");
printf("\n\n\t\t%-8s%-8s%-8s%-8d%-8s\n",s[i].no,s[i].name,s[i].spec,s[i].grade,s[i].sex);
printf("\n\t---------------------------------------------------");
}
if(i==4&&s[i].grade!=a)
{
printf("\n\t\t查無此人！");

}
}
printf("\n\n返回首頁（請按任意鍵）：");
getchar();
scanf("%c",&d);
system("cls");
fun(s);
}
void fun4(struct student *s)
{
int i;
char d;
printf("\n\n\t\t學號\t姓名\t專業\t年級\t性別");
printf("\n\t---------------------------------------------------");
for(i=0;i<5;i++)
{
printf("\n\n\t\t%-8s%-8s%-8s%-8d%-8s",s[i].no,s[i].name,s[i].spec,s[i].grade,s[i].sex);
}
printf("\n\t---------------------------------------------------\n");
printf("返回首頁（請按任意鍵）：");
scanf("%c",&d);
getchar();
system("cls");
fun(s);
}
void fun5(struct student *s)
{
char a[20],d;
int i;
printf("\n\n\t請輸入要修改學生的姓名：");
scanf("%s",a);
for(i=0;i<5;i++)
{
if(!strcmp(s[i].name,a))
{ printf("\n\t\t請輸入修改學號：");
scanf("%s",s[i].no);
printf("\n\t\t請輸入修改專業：");
scanf("%s",s[i].spec);
printf("\n\t\t請輸入修改年級：");
scanf("%d",&s[i].grade);
printf("\n\t\t請輸入修改性別：");
scanf("%s",s[i].sex);
getchar('\n');
system("cls");
}
}
printf("\n\n\t\t學號\t姓名\t專業\t年級\t性別");
printf("\n\t---------------------------------------------------");
for(i=0;i<5;i++)
{
printf("\n\n\t\t%-8s%-8s%-8s%-8d%-8s",s[i].no,s[i].name,s[i].spec,s[i].grade,s[i].sex);
}
printf("\n\t---------------------------------------------------\n");
printf("返回首頁（請按任意鍵）：");
scanf("%c",&d);
system("cls");
fun(s);
}
void fun6(struct student *s)
{
char a[20],d;
int i,k;
printf("\n\n\t請輸入要刪除學生的姓名：");
scanf("%s",a);
for(i=0;i<5;i++)
{
if(!strcmp(s[i].name,a))
{
s[i]=s[i+1];
printf("\n\t此學生的信息：");
printf("\n\n\t\t學號\t姓名\t專業\t年級\t性別");
printf("\n\t---------------------------------------------------");
for(k=0;k<4;k++)
{
printf("\n\n\t\t%-8s%-8s%-8s%-8d%-8s\n",s[k].no,s[k].name,s[k].spec,s[k].grade,s[k].sex);
}
printf("\n\t---------------------------------------------------");
}
if(i==4)
{
printf("沒有此人！");
}
}
printf("返回首頁（請按任意鍵）：");
getchar();
scanf("%c",&d);
system("cls");
fun(s);
}

『肆』 學生成績管理（C語言）

#include<stdio.h> /*引用庫函數*/
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
typedef struct /*定義結構體數組*/
{
char num[10]; /*學號*/
char name[20]; /*姓名*/
int score; /*成績*/
}Student;
Student stu[80]; /*結構體數組變數*/
int menu_select() /*菜單函數*/
{
char c;
do{
system("cls"); /*運行前清屏*/
printf("\t\t****Students' Grade Management System****\n"); /*菜單選擇*/
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(); /*讀入選擇*/
}while(c<'0'||c>'9');
return(c-'0'); /*返回選擇*/
}
int Input(Student stud[],int n) /*輸入若干條記錄*/
{int i=0;
char sign,x[10]; /*x[10]為清除多餘的數據所用*/
while(sign!='n'&&sign!='N') /*判斷*/
{ printf("\t\t\tstudent's num:"); /*交互輸入*/
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); /*清除多餘的輸入*/
printf("\t\t\tany more records?(Y/N)");
scanf("\t\t\t%c",&sign); /*輸入判斷*/
i++;
}
return(n+i);
}
void Display(Student stud[],int n) /*顯示所有記錄*/
{
int i;
printf("\t\t\t-----------------------------------\n"); /*格式頭*/
printf("\t\t\tnumber name score\n");
printf("\t\t\t-----------------------------------\n");
for(i=1;i<n+1;i++) /*循環輸入*/
{
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) /*每十個暫停*/
{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) /*按學號排序*/
{ 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) /*插入一條記錄*/
{char x[10]; /*清除多餘輸入所用*/
printf("\t\t\tstudent's num:"); /*互動式輸入*/
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); /*調用排序函數*/
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，刪除一條記錄*/
{ char s[20];
int i=0,j;
printf("\t\t\ttell me his(her) name:"); /*互動式問尋*/
scanf("%s",s);
while(strcmp(stud[i].name,s)!=0&&i<n) i++; /*查找判斷*/
if(i==n)
{ printf("\t\t\tnot find!\n"); /*返回失敗信息*/
return(n);
}
for(j=i;j<n-1;j++) /*刪除操作*/
{
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) /*查找並顯示一個記錄*/
{ char s[20];
int i=0;
printf("\t\t\tinput his(her) name:"); /*互動式輸入*/
scanf("\t\t\t%s",s);
while(strcmp(stud[i].name,s)!=0&&i<n) i++; /*查找判斷*/
if(i==n)
{ printf("\t\t\tnot find!\n"); /*輸入失敗信息*/
return;

}
printf("\t\t\this(her) number:%s\n",stud[i].num); /*輸出該學生信息*/
printf("\t\t\this(her) score:%d\n",stud[i].score);
}
void Statistic(Student stud[],int n) /*新增功能，輸出統計信息*/
{ int i,j=0,k=0,sum=0;
float aver; /*成績平均值*/
for(i=0;i<n;i++) /*循環輸入判斷*/
{
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); /*總共記錄數*/
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) /*從文件中讀入數據*/
{ int i=0,num;
FILE *fp; /*定義文件指針*/
char filename[20]; /*定義文件名*/
printf("\t\t\tInput the filename:");
scanf("\t\t\t%s",filename); /*輸入文件名*/
if((fp=fopen(filename,"rb"))==NULL) /*打開文件*/
{ printf("\t\t\tcann't open the file\n"); /*打開失敗信息*/
printf("\t\t\t");
system("pause");
return(n);
}
fscanf(fp,"%d",&num); /*讀入總記錄量*/
while(i<num) /*循環讀入數據*/
{
fscanf(fp,"%s%s%d",stud[n+i].num,stud[n+i].name,&stud[n+i].score);
i++;
}
n+=num;
fclose(fp); /*關閉文件*/
printf("\t\t\tSuccessed!\n");
printf("\t\t\t");
system("pause");
return(n);
}
void WritetoText(Student stud[],int n) /*將所有記錄寫入文件*/
{
int i=0;
FILE *fp; /*定義文件指針*/
char filename[20]; /*定義文件名*/
printf("\t\t\tWrite Records to a Text File\n"); /*輸入文件名*/
printf("\t\t\tInput the filename:");
scanf("\t\t\t%s",filename);
if((fp=fopen(filename,"w"))==NULL) /*打開文件*/
{
printf("\t\t\tcann't open the file\n");
system("pause");
return;
}
fprintf(fp,"%d\n",n); /*循環寫入數據*/
while(i<n)
{
fprintf(fp,"%-16s%-15s%d\n",stud[i].num,stud[i].name,stud[i].score);
i++;
}
fclose(fp); /*關閉文件*/
printf("Successed!\n"); /*返回成功信息*/
}
void main() /*主函數*/
{
int n=0;
for(;;)
{
switch(menu_select()) /*選擇判斷*/
{
case 1:
printf("\t\t\tInput Records\n"); /*輸入若干條記錄*/
n=Input(stu,n);
break;
case 2:
printf("\t\t\tDisplay All Records\n"); /*顯示所有記錄*/
Display(stu,n);
break;
case 3:
printf("\t\t\tSort\n");
Sort_by_num(stu,n); /*按學號排序*/
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); /*插入一條記錄*/
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，刪除一條記錄*/
printf("\t\t\t");
system("pause");
break;
case 6:
printf("\t\t\tQuery\n");
Query_a_record(stu,n); /*查找並顯示一個記錄*/
printf("\t\t\t");
system("pause");
break;
case 7:
printf("\t\t\tStatistic\n");
Statistic(stu,n); /*新增功能，輸出統計信息*/
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，輸出統計信息*/
break;
case 9:
printf("\t\t\tWrite to a Text file\n");
WritetoText(stu,n); /*循環寫入數據*/
printf("\t\t\t");
system("pause");
break;
case 0:
printf("\t\t\tHave a Good Luck,Bye-bye!\n"); /*結束程序*/
printf("\t\t\t");
system("pause");
exit(0);

『伍』 學生成績管理： c語言

參考代碼如下，不過還是建議自己寫一寫比較好：
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct student //結構體
{
char name[20]; //姓名
char number[20]; //學號
double math; //數學
double english; //英語
double chinese; //語文
double program; //程序
}s[50];
void head() //界面
{
printf(
"**********************************************************************\n"
"** **\n"
"** **\n"
"** 學生成績管理系統 **\n"
"** **\n"
"** 1.信息錄入 **\n"
"** 2.信息統計 **\n"
"** 3.信息瀏覽 **\n"
"** 4.信息查詢 **\n"
"** 5.信息排序 **\n"
"** 6.信息刪除 **\n"
"** 0.退出系統 **\n"
"** **\n"
"**********************************************************************\n"
);
}
void ru(struct student s[], int* n) //文件導入函數
{
FILE *p;
int i=*n;
if((p=fopen("數據.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("數據.txt", "w"))==NULL)
{
printf("無法打開此文件！");
}
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) //顯示所有信息
{
int i;
double all=0.0;
printf("\n姓名\t\t學號\t\t數學\t英語\t語文\t程序\t總分\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) //信息輸入函數
{
int i=*n, j, k, m;
printf("請輸入學生姓名:");
scanf("%s", s[i].name);
printf("請輸入學生學號:");
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("學號重復，請重新輸入學號:");
break;
}
}
if (m==0)
{
break;
}
}
printf("請輸入數學成績:");
scanf("%lf", &s[i].math);
printf("請輸入英語成績:");
scanf("%lf", &s[i].english);
printf("請輸入語文成績:");
scanf("%lf", &s[i].chinese);
printf("請輸入程序成績:") ;
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) //排序函數
{
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("排序後的數據：\n");
dayin(s, n);
}
void chazhao(struct student s[], int n) //查找函數
{
char name[20], num[20];
int m1, m2=0, i, j;
printf("1.按姓名查找\n2.按學號查找\n選擇查詢方式（1或2）:");
scanf("%d", &m1);
if (m1==1)
{
printf("請輸入您要查找的學生姓名:");
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學號\t數學\t英語\t語文\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("沒有此學生信息!\n");
}
}
else if (m1==2)
{
printf("請輸入您要查找的學生學號:");
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學號\t數學\t英語\t語文\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("沒有此學生信息!\n");
}
}
}
void shanchu(struct student s[], int* n) //刪除函數
{
char num[20];
int m=0, i, j;
printf("請輸入您要刪除的學生學號:");
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("沒有此學生信息!\n");
}
else
{
chu(s, *n);
printf("刪除完畢!\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) //統計單科不及格人數
{
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("數學不及格的人數為：%d人\n", fail[0]);
printf("英語不及格的人數為：%d人\n", fail[1]);
printf("語文不及格的人數為：%d人\n", fail[2]);
printf("程序不及格的人數為：%d人\n", fail[3]);
}
void Max(struct student s[], int n) //統計單科最高分人數
{
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("數學最高分為：%.1lf, 人數為：%d人\n", max[0], counter[0]);
printf("英語最高分為：%.1lf, 人數為：%d人\n", max[1], counter[1]);
printf("語文最高分為：%.1lf, 人數為：%d人\n", max[2], counter[2]);
printf("程序最高分為：%.1lf, 人數為：%d人\n", max[3], counter[3]);
}
void Min(struct student s[], int n) //統計單科最低分人數
{
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("數學最低分為：%.1lf, 人數為：%d人\n", min[0], counter[0]);
printf("英語最低分為：%.1lf, 人數為：%d人\n", min[1], counter[1]);
printf("語文最低分為：%.1lf, 人數為：%d人\n", min[2], counter[2]);
printf("程序最低分為：%.1lf, 人數為：%d人\n", min[3], counter[3]);
}
void tongji(struct student s[], int n) //統計函數
{
printf("統計信息如下：\n");
printf("\n姓名\t\t學號\t\t總分\t平均分\n");
allAndAver(s, n);
Max(s, n);
Min(s, n) ;
Fail(s, n);
}
int main() //主函數
{
int k, n=0;
ru(s, &n);
chu(s, n);
while (1)
{
head();
printf("\n請按對應的鍵選擇相應的功能:");
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("請輸入正確的命令!\n");
}
system("pause");
system("cls");
}
return 0;
}

『陸』 （C語言）學生成績管理系統

.h文件
#if !defined __HEAD1__H__
#define __HEAD1__H__
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class student{
public:
int GetNumber();
char *GetName();
char *GetClass();
float GetElec();
float GetC_prog();
float GetEng();
float GetMedia();
float GetMath();
float GetPolity();
float GetSport();
void input();
private:
int Number;
char class_0[20];
char Name[8];
float elec;
float c_prog;
float media;
float eng;
float math;
float sport;
float polity;
float Totalcent;
float Average;
};
int student::GetNumber()
{
return Number;
}
char *student::GetName()
{
return Name;
}
char *student::GetClass()
{
return class_0;
}
float student::GetElec()
{
return elec;
}
float student::GetC_prog()
{
return c_prog;
}
float student::GetEng()
{
return eng;
}
float student::GetMath()
{
return math;
}
float student::GetMedia()
{
return media;
}
float student::GetSport()
{
return sport;
}
float student::GetPolity()
{
return polity;
}
void student::input()
{
cout<<"學號：";
cin>>Number;
cout<<"姓名：";
cin>>Name;
cout<<"班級：";
cin>>class_0;
cout<<"電子技術：";
cin>>elec;
cout<<"C++ 程序設計：";
cin>>c_prog;
cout<<"多媒體技術：";
cin>>media;
cout<<"大學英語：";
cin>>eng;
cout<<"高等數學：";
cin>>math;
cout<<"大學體育：";
cin>>sport;
cout<<"馬克思主義政治經濟學：";
cin>>polity;
}
#endif
.C文件
#include<iostream>
#include<string>
#include<iomanip>
#include"1.h"
using namespace std;
int i=0,n=0;
float allscore[50];
student s[50];
void insert();
void delete1();
void find();
void xiugai();
void tongji();
void sort();
void input();
void output();
void contin()
{
cout<<"是否繼續操作（y/n）";
char a; int j;
cin>>a;
while(a!='y'&&a!='n')
cin>>a;
if(a=='y')
{
cout<<"你想繼續做什麼：";
cin>>j;
while(!(j<=8&&j>=1))
{
cout<<"The number is too big or small,please input it again.";
cin>>j;
}
switch(j)
{
case 1:cout<<"1、按順序輸入若干個學生的信息"<<endl<<endl;input();break;
case 2:cout<<"2、插入一個學生信息"<<endl<<endl;insert();break;
case 3:cout<<"3、刪除一個學生信息"<<endl<<endl;delete1();break;
case 4:cout<<"4、修改一個學生信息（按學號來找）"<<endl<<endl;xiugai();break;
case 5:cout<<"5、查找一個學生信息（按姓名來找）"<<endl;find();break;
case 6:cout<<"6、統計學生的總分成績"<<endl<<endl;tongji();break;
case 7:cout<<"7、按總分從高到低排序"<<endl<<endl;sort();break;
case 8:cout<<"8、顯示所有學生信息"<<endl<<endl;output();break;
}
}
else if(a=='n') cout<<"操作結束!!!"<<endl;
}
void input()
{
cout<<"你想輸入多少個學生信息:";
cin>>n;
for(i=0;i<n;i++)
{
s[i].input();
}
for(i=0;i<n;i++)
{
allscore[i]=s[i].GetElec()+s[i].GetElec()+s[i].GetMedia()+s[i].GetEng()+s[i].GetMath()+s[i].GetSport()+s[i].GetPolity();
}
contin();
}
void output()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
cout<<"每位學生的信息分別為："<<endl;
cout<<"---------------------------------------------------------------------------"<<endl;
cout<<setw(15)<<"姓名"<<setw(10)<<"學號"<<setw(12)<<"班級:"<<setw(12)<<"電子技術"<<setw(12)<<"C++ 程序設計"<<setw(12)<<"多媒體技術"<<setw(12)<<"大學英語"<<setw(12)<<"高等數學"<<setw(12)<<"大學體育"<<setw(12)<<"馬克思主義政治經濟學"<<setw(12)<<"總分"<<endl;
for(i=0;i<n;i++)
{
cout<<setw(15)<<s[i].GetName()<<setw(10)<<s[i].GetNumber()<<setw(12)<<s[i].GetClass()<<s[i].GetElec()<<setw(12)<<s[i].GetC_prog()<<setw(12)<<s[i].GetMedia()<<setw(12)<<s[i].GetEng()<<setw(12)<<s[i].GetMath()<<setw(12)<<s[i].GetSport()<<setw(12)<<s[i].GetPolity()<<setw(12)<<allscore[i]<<endl;
}
contin();
}
void insert()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
cout<<"請輸入你要插入的位置：";
int k;
cin>>k;
while(!(k>0&&k<=n))
{
cout<<"操作錯誤，請重新操作:";
cin>>k;
}
if(k<=n)
{
n++;
for(int i=n-1;i>=k;i--)
{

s[i]=s[i-1];
}
}
s[k-1].input();
contin();
}
void delete1()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
cout<<"請輸入你要刪除的位置：";
int k;
cin>>k;
while(!(k>=0&&k<n))
{
cout<<"你輸入的位置不存在，請重新輸入";
cin>>k;
}
for(i=k-1;i<n;i++)
{
s[i]=s[i+1];
}
n--;
contin();
}
void xiugai()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
int num;
char c;
do{
cout<<"請輸入需要修改的學生的學號：";
cin>>num;
for(int i=0;i<n;i++)
{
if(s[i].GetNumber()==num)
{
s[i].input();
}
else {cout<<"沒有這個學生."<<endl;break;}
}
cout<<"是否還要修改（y/n）";
cin>>c;
while(c!='y'&&c!='n')
cin>>c;
}while(c=='y');
contin();
}
void find()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
char na[15];
cin>>na;
for(int i=0;i<n;i++)
{
if(strcmp(s[i].GetName(),na)==0)
{
cout<<setw(30)<<"所查找的學生信息為："<<endl;
cout<<"---------------------------------------------------------------------------"<<endl;
cout<<setw(15)<<"姓名"<<setw(10)<<"學號"<<setw(12)<<"班級:"<<setw(12)<<"電子技術"<<setw(12)<<"C++ 程序設計"<<setw(12)<<"多媒體技術"<<setw(12)<<"大學英語"<<setw(12)<<"高等數學"<<setw(12)<<"大學體育"<<setw(12)<<"馬克思主義政治經濟學"<<setw(12)<<"總分"<<endl;
cout<<setw(15)<<s[i].GetName()<<setw(10)<<s[i].GetNumber()<<setw(12)<<s[i].GetClass()<<s[i].GetElec()<<setw(12)<<s[i].GetC_prog()<<setw(12)<<s[i].GetMedia()<<setw(12)<<s[i].GetEng()<<setw(12)<<s[i].GetMath()<<setw(12)<<s[i].GetSport()<<setw(12)<<s[i].GetPolity()<<setw(12)<<allscore[i]<<endl;
cout<<"---------------------------------------------------------------------------"<<endl;
}
else cout<<"沒有這個學生."<<endl;
}
contin();
}
void tongji()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
for(i=0;i<n;i++)
allscore[i]=s[i].GetElec()+s[i].GetElec()+s[i].GetMedia()+s[i].GetEng()+s[i].GetMath()+s[i].GetSport()+s[i].GetPolity();
cout<<"各位學生的總分分別是";
for(i=0;i<n;i++)
{
cout<<"第"<<i+1<<"位同學是："<<s[i].GetName()<<"總分是："<<allscore[i]<<endl;
}
contin();
}
void sort()
{
if(n<=0)
{
cout<<"請先輸入學生的信息,";
input();
}
student temp;
for(i=0;i<n;i++)
for(int j=i;j<n;j++)
if(allscore[i]<allscore[j])
{
temp=s[i];
s[i]=s[j];
s[j]=temp;
}
cout<<"已經排好序了，是否需要輸出（y/n）:";
char yn;
cin>>yn;
while(yn!='y'&&yn!='n')
{
cout<<"操作錯誤！！！請重新輸入：";
cin>>yn;
}
if(yn=='y')
{
cout<<"所有學生的成績按總分從高到低的排名是："<<endl;
output();
}
else contin();
}
int main()
{
cout<<setw(30)<<"學生管理系統"<<endl;
for(int s=1;s<=30;s++)
cout<<"*";
cout<<" ***";
for(s=1;s<=30;s++)
cout<<"*";
cout<<endl;
cout<<" 在這個學生管理系統中，你可以做以各方面的內容："<<endl;
cout<<"--------------------------------------------------------------------------------------------------"<<endl;
cout<<" 1、按順序輸入若干個學生的信息；"<<endl;
cout<<" 2、插入一個學生信息"<<endl;
cout<<" 3、刪除一個學生信息"<<endl;
cout<<" 4、修改一個學生信息（按學號來找）"<<endl;
cout<<" 5、查找一個學生信息（按學號來找）"<<endl;
cout<<" 6、統計學生的總分成績"<<endl;
cout<<" 7、按總分從高到低排序"<<endl;
cout<<" 8、顯示所有學生信息。"<<endl;
cout<<"-----------------------------------------------------------------------------------------------------"<<endl;
cout<<"你想要做什麼：";
int k;
cin>>k;
while((k<=0||k>9))
{
cout<<"The number is too big or small,please input it again.";
cin>>k;
}
switch(k)
{
case 1:cout<<"1、按順序輸入若干個學生的信息"<<endl<<endl;input();break;
case 2:cout<<"2、插入一個學生信息"<<endl<<endl;insert();break;
case 3:cout<<"3、刪除一個學生信息"<<endl<<endl;delete1();break;
case 4:cout<<"4、修改一個學生信息（按學號來找）"<<endl<<endl;xiugai();break;
case 5:cout<<"5、查找一個學生信息（按姓名來找）"<<endl<<endl;find();break;
case 6:cout<<"6、統計學生的總分成績"<<endl<<endl;tongji();break;
case 7:cout<<"7、按總分從高到低排序"<<endl<<endl;sort();break;
case 8:cout<<"8、顯示所有學生信息"<<endl<<endl;output();break;
case 9:cout<<"9、操作

『柒』 c語言學生成績管理

測試過了
/*頭文件*/
#include <stdio.h>
#include<dos.h>
#include<stdlib.h> /*其它說明*/
#include<string.h> /*字元串函數*/
#include<memory.h> /*內存操作函數*/
#include<ctype.h> /*字元操作函數*/
#include "conio.h"
#define LEN sizeof(STUDENT)
typedef struct stu /*定義結構體數組用於緩存數據*/
{char num[6];
char name[5];
int score[3];
int sum;
float average;
int order;
struct stu *next;
}STUDENT;

/*函數原型*/
STUDENT *init(); /*初始化函數*/
int menu_select(); /*菜單函數*/
STUDENT *create(); /*創建鏈表*/
void print(STUDENT *head); /* 顯示全部記錄*/
void search(STUDENT *head); /*查找記錄*/
STUDENT *mydelete(STUDENT *head); /*刪除記錄*/
STUDENT *sort(STUDENT *head); /*排序*/
STUDENT *insert(STUDENT *head,STUDENT *mynew); /*插入記錄*/
void save(STUDENT *head); /*保存文件*/
STUDENT *load(); /*讀文件*/

/*主函數界面*/
void main()
{STUDENT *head,mynew;
head=init(); /*鏈表初始化,使head的值為NULL*/
for(;;) /*循環無限次*/
{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); /*如菜單返回值為9則程序結束*/
}
}
}

/*初始化函數*/
STUDENT *init()
{
return NULL; /*返回空指針*/
}

/*菜單選擇函數*/
menu_select()
{int n;
printf("\n按任一鍵進入主菜單...... \npress any key to enter the menu......"); /*按任一鍵進入主菜單*/
getch(); /*從鍵盤讀取一個字元,但不顯示於屏幕*/
system("cls");
printf("********************************************************************************\n");
printf("\t\t 歡迎 Welcome to\n");
printf("\n\t\t\t 使用學生管理系統1.0\n\n\t\t\t\t\t\n");
printf("*************************************MENU***************************************\n");
printf("\t\t\t1. 輸入學生成績記錄 Enter the record\n"); /*輸入學生成績記錄*/
printf("\t\t\t2. 顯示 Print the record\n"); /*顯示*/
printf("\t\t\t3. 尋找 Search record on name\n"); /*尋找*/
printf("\t\t\t4. 刪除 mydelete a record\n"); /*刪除*/
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. 讀取 Load the file\n"); /*讀取*/
printf("\t\t\t9. 退出 Quit\n"); /*退出*/
printf("********************************************************************************\n");
do{
printf("\n\t\t\t輸入你的選擇Enter your choice(1~9):");
scanf("%d",&n);
}while(n<1||n>9); /*如果選擇項不在1~9之間則重輸*/
return(n); /*返回選擇項，主函數根據該數調用相應的函數*/
}

/*輸入函數*/
STUDENT *create()
{int i,s;
STUDENT *head=NULL,*p; /* 定義函數.此函數帶回一個指向鏈表頭的指針*/
system("cls");
for(;;)
{p=(STUDENT *)malloc(LEN); /*開辟一個新的單元*/
if(!p) /*如果指針p為空*/
{printf("\n輸出內存溢出. Out of memory."); /*輸出內存溢出*/
return (head); /*返回頭指針,下同*/
}
printf("輸入學號Enter the num(0:list end):");
scanf("%s",p->num);
if(p->num[0]=='0') break; /*如果學號首字元為0則結束輸入*/
printf("輸入名字Enter the name:");
scanf("%s",p->name);
printf("請輸入3門成績Please enter the %d scores\n",3); /*提示開始輸入成績*/
s=0; /*計算每個學生的總分，初值為0*/
for(i=0;i<3;i++) /*3門課程循環3次*/
{
do{
printf("成績score%d:",i+1);
scanf("%d",&p->score[i]);
if(p->score[i]<0 || p->score[i]>100) /*確保成績在0~100之間*/
printf("數據錯誤,請重新輸入 Data error,please enter again.\n");
}while(p->score[i]<0 || p->score[i]>100);
s=s+p->score[i]; /*累加各門成績*/
}
p->sum=s; /*將總分保存*/
p->average=(float)s/3; /*先用強制類型轉換將s轉換成float型,再求平均值*/
p->order=0; /*未排序前此值為0*/
p->next=head; /*將頭結點做為新輸入結點的後繼結點*/
head=p; /*新輸入結點為新的頭結點*/
}
return(head);
}

/* 顯示全部記錄函數*/
void print(STUDENT *head)
{int i=0; /* 統計記錄條數*/
STUDENT *p; /*移動指針*/
system("cls");
p=head; /*初值為頭指針*/
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");
}

/*查找記錄函數*/
void search(STUDENT *head)
{STUDENT *p; /* 移動指針*/
char s[5]; /*存放姓名用的字元數組*/
system("cls");
printf("請輸入個姓名來查找. Please enter name for searching.\n");
scanf("%s",s);
p=head; /*將頭指針賦給p*/
while(strcmp(p->name,s) && p != NULL) /*當記錄的姓名不是要找的，或指針不為空時*/
p=p->next; /*移動指針，指向下一結點*/
if(p!=NULL) /*如果指針不為空*/
{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沒有該學生 There is no num %s student on the list.\n",s); /*顯示沒有該學生*/
}

/*刪除記錄函數*/
STUDENT *mydelete(STUDENT *head)
{int n;
STUDENT *p1,*p2; /*p1為查找到要刪除的結點指針，p2為其前驅指針*/
char c,s[6]; /*s[6]用來存放學號,c用來輸入字母*/
system("cls");
printf("請輸入要刪除的學號 Please enter the mydeleted num: ");
scanf("%s",s);
p1=p2=head; /*給p1和p2賦初值頭指針*/
while(strcmp(p1->num,s) && p1 != NULL) /*當記錄的學號不是要找的，或指針不為空時*/
{p2=p1; /*將p1指針值賦給p2作為p1的前驅指針*/
p1=p1->next; /*將p1指針指向下一條記錄*/
}
if(strcmp(p1->num,s)==0) /*學號找到了*/
{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是否要刪除,輸入Y刪除,N則退出\nAre you sure to mydelete the student Y/N ?"); /*提示是否要刪除,輸入Y刪除,N則退出*/
for(;;)
{scanf("%c",&c);
if(c=='n'||c=='N') break; /*如果不刪除,則跳出本循環*/
if(c=='y'||c=='Y')
{
if(p1==head) /*若p1==head，說明被刪結點是首結點*/
head=p1->next; /*把第二個結點地址賦予head*/
else
p2->next=p1->next; /*否則將一下結點地址賦給前一結點地址*/
n=n-1;
printf("\n學號為(Num): %s 學生以被刪除(student have been mydeleted.)\n",s);
printf("別忘了保存. Don't forget to save.\n");break; /*刪除後就跳出循環*/
}
}
}
else
printf("\n沒有這個學生在表上\nThere is no num %s student on the list.\n",s); /*找不到該結點*/
return(head);
}

/*排序函數*/
STUDENT *sort(STUDENT *head)
{int i=0; /*保存名次*/
STUDENT *p1,*p2,*t,*temp; /*定義臨時指針*/
temp=head->next; /*將原表的頭指針所指的下一個結點作頭指針*/
head->next=NULL; /*第一個結點為新表的頭結點*/
while(temp!=NULL) /*當原表不為空時，進行排序*/
{
t=temp; /*取原表的頭結點*/
temp=temp->next; /*原表頭結點指針後移*/
p1=head; /*設定移動指針p1，從頭指針開始*/
p2=head; /*設定移動指針p2做為p1的前驅，初值為頭指針*/
while(t->average<p1->average&&p1!=NULL) /*作成績平均分比較*/
{
p2=p1; /*待排序點值小，則新表指針後移*/
p1=p1->next;
}
if(p1==p2) /*p1==p2，說明待排序點值大，應排在首位*/
{
t->next=p1; /*待排序點的後繼為p*/
head=t; /*新頭結點為待排序點*/
}
else /*待排序點應插入在中間某個位置p2和p1之間，如p為空則是尾部*/
{
t->next=p1; /*t的後繼是p1*/
p2->next=t; /*p2的後繼是t*/
}
}
p1=head; /*已排好序的頭指針賦給p1，准備填寫名次*/
while(p1!=NULL) /*當p1不為空時，進行下列操作*/
{
i++; /*結點序號*/
p1->order=i; /*將結點序號賦值給名次*/
p1=p1->next; /*指針後移*/
}
printf("排序成功 Sorting is sucessful.\n"); /*排序成功*/
return (head);
}

/*插入記錄函數*/
STUDENT *insert(STUDENT *head,STUDENT *mynew)
{STUDENT *p0,*p1,*p2;
int n,sum1,i;
p1=head; /*使p1指向第一個結點*/
p0=mynew; /*p0指向要插入的結點*/
printf("\nPlease enter a mynew record.\n"); /*提示輸入記錄信息*/
printf("輸入學號Enter the num:");
scanf("%s",mynew->num);
printf("輸入名字Enter the name:");
scanf("%s",mynew->name);
printf("Please enter the %d scores.\n",3);
sum1=0; /*保存新記錄的總分，初值為0*/
for(i=0;i<3;i++)
{
do{
printf("成績score%d:",i+1);
scanf("%d",&mynew->score[i]);
if(mynew->score[i]>100||mynew->score[i]<0)
printf("數據錯誤Data error,please enter again.\n");
}while(mynew->score[i]>100||mynew->score[i]<0);
sum1=sum1+mynew->score[i]; /*累加各門成績*/
}
mynew->sum=sum1; /*將總分存入新記錄中*/
mynew->average=(float)sum1/3;
mynew->order=0;
if(head==NULL) /*原來的鏈表是空表*/
{head=p0;p0->next=NULL;} /*使p0指向的結點作為頭結點*/
else
{while((p0->average<p1->average)&&(p1->next!=NULL))
{p2=p1; /*使p2指向剛才p1指向的結點*/
p1=p1->next; /*p1後移一個結點*/
}
if(p0->average>=p1->average)
{if(head==p1)head=p0; /*插到原來第一個結點之前*/
else p2->next=p0; /*插到p2指向的結點之後*/
p0->next=p1;}
else
{p1->next=p0;p0->next=NULL;} /*插到最後的結點之後*/
}
n=n+1; /*結點數加1*/
head=sort(head); /*調用排序的函數,將學生成績重新排序*/
printf("\n學生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);
}

/*保存數據到文件函數*/
void save(STUDENT *head)
{FILE *fp; /*定義指向文件的指針*/
STUDENT *p; /* 定義移動指針*/
char outfile[10];
printf("輸出文件例如:c:\\score Enter outfile name,for example c:\\score\n");
scanf("%s",outfile);
if((fp=fopen(outfile,"w"))==NULL) /*為輸出打開一個二進制文件,為只寫方式*/
{
printf("打不開文件Cannot open the file\n");
return; /*若打不開則返回菜單*/
}
printf("\n保存中...Saving the file......\n");
p=head; /*移動指針從頭指針開始*/
while(p!=NULL) /*如p不為空*/
{
fwrite(p,LEN,1,fp); /*寫入一條記錄*/
p=p->next; /*指針後移*/
}
fclose(fp); /*關閉文件*/
printf("保存成功....Save the file successfully!\n");
}

/* 從文件讀數據函數*/
STUDENT *load()
{STUDENT *p1,*p2,*head=NULL; /*定義記錄指針變數*/
FILE *fp; /* 定義指向文件的指針*/
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) /*打開一個二進制文件，為只讀方式*/
{
printf("打不開文件Can not open the file.\n");
return(head);
}
printf("\n尋找文件...Loading the file!\n");
p1=(STUDENT *)malloc(LEN); /*開辟一個新單元*/
if(!p1)
{
printf("內存溢出!Out of memory!\n");
return(head);
}
head=p1; /*申請到空間，將其作為頭指針*/
while(!feof(fp)) /*循環讀數據直到文件尾結束*/
{
if(fread(p1,LEN,1,fp)!=1) break; /*如果沒讀到數據，跳出循環*/
p1->next=(STUDENT *)malloc(LEN); /*為下一個結點開辟空間*/
if(!p1->next)
{
printf("Out of memory!\n");
return (head);
}
p2=p1; /*使p2指向剛才p1指向的結點*/
p1=p1->next; /*指針後移，新讀入數據鏈到當前表尾*/
}
p2->next=NULL; /*最後一個結點的後繼指針為空*/
fclose(fp);
printf("\n你成功的從文件中讀取了數據!\nYou have success to read data from the file!\n");
return (head);
}

『捌』 c語言 學生成績管理

||#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);
}

進入修改數據的密碼是1234 你有三次機會輸入密碼
在vc++中調試成功 有問題hi我

『玖』 C語言學生成績管理程序

#include"stdio.h"

/*定義學生結構體*/

structStudent

{

charID[20];

charName[20];

floatMark1;

floatMark2;

floatMark3;

floatAverage;

};

/*聲明學生數組及學生數量*/

structStudentstudents[1000];

intnum=0;

/*求平均值*/

floatAvg(structStudentstu)

{

return(stu.Mark1+stu.Mark2+stu.Mark3)/3;

}

/*通過學號返回數組下標*/

intStudent_SearchByIndex(charid[])

{

inti;

for(i=0;i<num;i++)

{

if(strcmp(students[i].ID,id)==0)

{

returni;

}

}

return-1;

}

/*通過姓名返回數組下標*/

intStudent_SearchByName(charname[])

{

inti;

for(i=0;i<num;i++)

{

if(strcmp(students[i].Name,name)==0)

{

returni;

}

}

return-1;

}

/*顯示單條學生記錄*/

voidStudent_DisplaySingle(intindex)

{

printf("%10s%10s%8s%8s%8s%10s
","學號","姓名","成績","成績","成績","平均成績");

printf("-------------------------------------------------------------
");

printf("%10s%10s%8.2f%8.2f%8.2f%10.2f
",students[index].ID,students[index].Name,

students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Average);

}

/*插入學生信息*/

voidStudent_Insert()

{

while(1)

{

printf("請輸入學號:");

scanf("%s",&students[num].ID);

getchar();

printf("請輸入姓名:");

scanf("%s",&students[num].Name);

getchar();

printf("請輸入成績:");

scanf("%f",&students[num].Mark1);

getchar();

printf("請輸入成績:");

scanf("%f",&students[num].Mark2);

getchar();

printf("請輸入成績:");

scanf("%f",&students[num].Mark3);

getchar();

students[num].Average=Avg(students[num]);

num++;

printf("是否繼續?(y/n)");

if(getchar()=='n')

{

break;

}

}

}

/*修改學生信息*/

voidStudent_Modify()

{

floatmark1,mark2,mark3;

while(1)

{

charid[20];

intindex;

printf("請輸入要修改的學生的學號:");

scanf("%s",&id);

getchar();

index=Student_SearchByIndex(id);

if(index==-1)

{

printf("學生不存在!
");

}

else

{

printf("你要修改的學生信息為:
");

Student_DisplaySingle(index);

printf("--請輸入新值--
");

printf("請輸入學號:");

scanf("%s",&students[index].ID);

getchar();

printf("請輸入姓名:");

scanf("%s",&students[index].Name);

getchar();

printf("請輸入成績:");

scanf("%f",&students[index].Mark1);

getchar();

printf("請輸入成績:");

scanf("%f",&students[index].Mark2);

getchar();

printf("請輸入成績:");

scanf("%f",&students[index].Mark3);

getchar();

students[index].Average=Avg(students[index]);

}

printf("是否繼續?(y/n)");

if(getchar()=='n')

{

break;

}

}

}

/*刪除學生信息*/

voidStudent_Delete()

{

inti;

while(1)

{

charid[20];

intindex;

printf("請輸入要刪除的學生的學號:");

scanf("%s",&id);

getchar();

index=Student_SearchByIndex(id);

if(index==-1)

{

printf("學生不存在!
");

}

else

{

printf("你要刪除的學生信息為:
");

Student_DisplaySingle(index);

printf("是否真的要刪除?(y/n)");

if(getchar()=='y')

{

for(i=index;i<num-1;i++)

{

students[i]=students[i+1];

}

num--;

}

getchar();

}

printf("是否繼續?(y/n)");

if(getchar()=='n')

{

break;

}

}

}

/*按姓名查詢*/

voidStudent_Select()

{

while(1)

{

charname[20];

intindex;

printf("請輸入要查詢的學生的姓名:");

scanf("%s",&name);

getchar();

index=Student_SearchByName(name);

if(index==-1)

{

printf("學生不存在!
");

}

else

{

printf("你要查詢的學生信息為:
");

Student_DisplaySingle(index);

}

printf("是否繼續?(y/n)");

if(getchar()=='n')

{

break;

}

}

}

/*按平均值排序*/

voidStudent_SortByAverage()

{

inti,j;

structStudenttmp;

for(i=0;i<num;i++)

{

for(j=1;j<num-i;j++)

{

if(students[j-1].Average<students[j].Average)

{

tmp=students[j-1];

students[j-1]=students[j];

students[j]=tmp;

}

}

}

}

/*顯示學生信息*/

voidStudent_Display()

{

inti;

printf("%10s%10s%8s%8s%8s%10s
","學號","姓名","成績","成績","成績","平均成績");

printf("-------------------------------------------------------------
");

for(i=0;i<num;i++)

{

printf("%10s%10s%8.2f%8.2f%8.2f%10.2f
",students[i].ID,students[i].Name,

students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average);

}

}

/*將學生信息從文件讀出*/

voidIO_ReadInfo()

{

FILE*fp;

inti;

if((fp=fopen("Database.txt","rb"))==NULL)

{

printf("不能打開文件!
");

return;

}

if(fread(&num,sizeof(int),1,fp)!=1)

{

num=-1;

}

else

{

for(i=0;i<num;i++)

{

fread(&students[i],sizeof(structStudent),1,fp);

}

}

fclose(fp);

}

/*將學生信息寫入文件*/

voidIO_WriteInfo()

{

FILE*fp;

inti;

if((fp=fopen("Database.txt","wb"))==NULL)

{

printf("不能打開文件!
");

return;

}

if(fwrite(&num,sizeof(int),1,fp)!=1)

{

printf("寫入文件錯誤!
");

}

for(i=0;i<num;i++)

{

if(fwrite(&students[i],sizeof(structStudent),1,fp)!=1)

{

printf("寫入文件錯誤!
");

}

}

fclose(fp);

}

/*主程序*/

main()

{

intchoice;

IO_ReadInfo();

while(1)

{

/*主菜單*/

printf("
------學生成績管理系統------
");

printf("1.增加學生記錄
");

printf("2.修改學生記錄
");

printf("3.刪除學生記錄
");

printf("4.按姓名查詢學生記錄
");

printf("5.按平均成績排序
");

printf("6.退出
");

printf("請選擇(1-6):");

scanf("%d",&choice);

getchar();

switch(choice)

{

case1:

Student_Insert();

break;

case2:

Student_Modify();

break;

case3:

Student_Delete();

break;

case4:

Student_Select();

break;

case5:

Student_SortByAverage();

Student_Display();

break;

case6:

exit();

break;

}

IO_WriteInfo();

}

}

『拾』 c語言學生成績管理

使用結構體存儲每個學生的信息，然後用簡單選擇排序或冒泡排序將平均成績排序