c繼承學生成績管理系統

A. 學生成績管理系統(C語言）

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<windows.h>
#define NUM_SUBJECT 4
typedef struct zl
{
char no[5]; /*學號*/
char name[6]; /*姓名*/
int score[NUM_SUBJECT]; /*各門學科成績*/
float total; /*總分*/
float average; /*平均分*/
int order; /*名次*/
}STUDENT;
int REC_NUM=0; /*學生記錄數*/
char*subject[]={"數學","電腦","物理","電工學"};
char*menu[]={"**************MENU***************",
"1. Enter new record",
"2. Display record",
"3. Search record",
"4. Modify record",
"5. Delete a record to list",
"6. Add a record to list",
"7. Sort to make new file",
"8. Save the file",
"9. Load the file",
"10. Quit"};
STUDENT records[10];
void newRec();
void showTable();
void showTable2(Iint);
void display();
void searchRec();
void modifyRec();
void deleteRec();
void addRec();
void orderRec();
void sortRec();
void saveRec();
void loadRec();
void Rec(STUDENT*,STUDENT*);
void quit();
int menu_select();
int findRec(char*,int,int);
void main()
{
system("cls");
for(;;)
{
switch(menu_select())
{
case 1: newRec();break;
case 2: display();break;
case 3: searchRec();break;
case 4: modifyRec();break;
case 5: deleteRec();break;
case 6: addRec();break;
case 7: sortRec();break;
case 8: saveRec();break;
case 9: loadRec();break;
case 10: quit();
}
}
}

int menu_select()
{
char s[3];
int c,i;
for(i=0;i<11;i++)
{
printf("%s",menu[i]);
}
window(1,1,80,25);
do
{
printf(" Enter you choice(1-10):");
scanf("%s",s);
c=atoi(s);
}while(c<0||c>11);
return c;
}
void showTable1()
{
system("cls");
printf("*****************STUDENT INFORMATION****************");
printf("????D?D?D?D?D?D?D?D?D?D???\n");
printf("|Rec | No | Name | Computer | Physics | English | total | Average | Order\n");
printf("?¨¤?¨¤?¨¤?¨¤?¨¤?¨¤?¨¤?¨¨\n");
}
void showTable2(int n)
{
if(n==0)n=1;
if(REC_NUM==0)n=-1;
printf("??????????????????\n");
}
void quit()
{
char str[5];
printf("Save records?(Y/N)");
scanf("%s",str);
if(str[0]=='Y'||str[0]=='y')
saveRec();
exit(0);
}
void newRec()
{
int i, j, sum;
system("cls");
printf("Please input the REC_NUM:");
scanf("%d",&REC_NUM);
for(i=0;i<REC_NUM;i++)
{
system("cls");
sum=0;
for(j=0;j<NUM_SUBJECT;j++);
{
scanf("%d",&records[i].score[j]);
sum=sum+records[i].score[j];
}
records[i].total=sum;
records[i].average=records[i].total/NUM_SUBJECT;
records[i].order=0;
}
}
void display()
{
int i=0;
showTable1();
for(i=0;i<REC_NUM;i++)
{
printf("|%2d |%4s |6s?%4d | %4d | %4d | %5.1f | %5.1f | %2d \n",i+1,records[i].no,records[i].name,records[i].score[0],records[i].score[1],records[i].score[2],records[i].score[3],records[i].total,records[i].average,records[i].order);
}
showTable2(i);
printf("Press any key to return!");
getch();
}
void saveRec()
{
FILE*fp1,*fp2;
if((fp1=fopen("d:\\cjt\\tc\\lianxiti\\keshe\\keshe.dat","wb"))==NULL)
{
printf("Cannot open this file!");
exit(1);
}
if((fp2=fopen("d:\\cjt\\tc\\lianxiti\\keshe\\keshe.dat","wb"))==NULL)
{
printf("Cannot open this file!");
exit(1);
}

printf("\nSaving file......\n");
fwrite(&REC_NUM,sizeof(REC_NUM),1,fp2);
fwrite(records,sizeof(STUDENT),REC_NUM,fp1);
fclose(fp1);fclose(fp2);
printf("n\Save success!!\n");delay(1000);
printf("\nPress any key to return!");
getch();
}
void loadRec()
{
FILE*fp1,*fp2;
if((fp1=fopen("d:\\cjt\\tc\\lianxiti\\keshe\\keshe.dat","rb"))==NULL)
{
printf("Cannot open this file!");
exit(1);
}
if((fp2=fopen("d:\\cjt\\tc\\lianxiti\\keshe\\keshe.dat","rb"))==NULL)
{
printf("Cannot open this file!");
exit(1);
}
system("cls");
printf("\nLoading file.....\n");
fread(&REC_NUM,sizeof(REC_NUM),1,fp2);
fread(records,sizeof(STUDENT),REC_NUM,fp1);
fclose(fp1);fclose(fp2);
delay(2000);
printf("\nYou have success read date from file!!!\n");
printf("\press any key to return!");
getch();
}
void searchRec()
{
char str[20];
int i;
system("cls");
printf("Please input the number you want to get:");
scanf("%s",str);
i=findRec(str,1,0);
if(i!=-1)
{
printf("|%2d |%4s | 6s| %4d | %4d | %4d | %4d| %5.1f | %5.1f | %2d \n",i+1,records[i].no,records[i].name,records[i].score[0],records[i].score[1],records[i].score[2],records[i].score[3],records[i].total,records[i].average,records[i].order);
showTable2(0);
}
else printf("Not find!\n");
printf("Press any key to return!");
getch();
}

void deleteRec()
{
int i, j;
char str[20];
system("cls");
printf("Please input the number you want to delete:");
scanf("%S",str);
i=findRec(str,1,0);
for(j=i;j<REC_NUM;j++)
records[j]=records[j+1];
REC_NUM--;
saveRec();
}
void Rec(STUDENT*src,STUDENT*dest)
{
int i;
strcpy(dest->no,src->no);
strcpy(dest->name,src->name);
for(i=0;i<NUM_SUBJECT;i++)
dest->score[i]=src->score[i];
dest->total=src->total;
dest->average=src->average;
dest->order=src->order;
}
void orderRec()
{
int i;
records[0].order=1;
for(i=1;i<REC_NUM;i++)
if(records[i].total==records[i-1].total)
records[i].order=records[i-1].order;
else
records[i].order=i+1;
}
void sortRec()
{
int i,j,flag;
STUDENT t;
system("cls");
printf("\nsorting file\n");
for(i=0;i<REC_NUM;i++)
{
flag=0;
for(j=REC_NUM-1;j>i;j--)
if(records[j].total>records[j-1].total)
{
Rec(&records[j],&t);
Rec(&records[j-1],&records[j]);
Rec(&t,&records[j-1]);
flag=1;
}
if(!flag) break;
}
orderRec();
delay(2000);
printf("\nsorting success\n");
saveRec();
}

int findRec(char *target,int tarType,int from)
{
int i;
for(i=from;i<REC_NUM;i++)
{
if((tarType==1&&strcmp(target,records[i].no)==0)
||tarType==2&&strcmp(target,records[i].name)==0)
return(i);
}
return(-1);
}
void modifyRec()
{
int i,j,sum;
char no[20],str[8];
system("cls");
printf("Please input the number you want to modify:");
scanf("%s",no);
i=findRec(no,1,0);
showTable1();
printf("| %2d | %4s | 6s |%4d |%4d | %4d | %4d | %5.1f | %5.1f|%2d |\n",i+1,records[i].no,records[i].name,records[i].score[0],records[i].score[1],records[i].score[2],records[i].score[3],records[i].total,records[i].average,records[i].order);
showTable2(0);
printf("Do you wang to modify this student(Y/N):");
scanf("%s",str);
if(str[0]=='y'||str[0]=='Y')
{
printf("enter number:");scanf("%s",records[i].no);
printf("enter name:");scanf("%s",records[i].name);
sum=0;
for(j=0;j<NUM_SUBJECT;j++)
{
printf("%s:",subject[j]);
scanf("%d",&records[i].score[j]);
sum=sum+records[i].score[j];
}
records[i].total=sum;
records[i].average=records[i].total/NUM_SUBJECT;
records[i].order=0;
}
printf("Press any key to return!");
getch();
}

void addRec()
{
int i,j,sum=0;
char no[20],str[8];
for(;;)
{
system("cls");
printf("Please input the number you want to add:");
scanf("%s",str);
i=findRec(str,1,0);
if(i==-1)break;
else printf("This number is exist!\n");
getch();
}
strcpy(records[REC_NUM].no,str);
printf("enter name:");scanf("%s",records[REC_NUM].name);
for(j=0;j<NUM_SUBJECT;j++)
{
printf("%s:",subject[j]);
scanf("%d",&records[REC_NUM].score[j]);
sum=sum+records[REC_NUM].score[j];
}
records[REC_NUM].total=sum;
records[REC_NUM].average=records[REC_NUM].total/NUM_SUBJECT;
records[REC_NUM].order=0;
REC_NUM++;
saveRec();
}

B. 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];

(2)c繼承學生成績管理系統擴展閱讀：

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）

C. C語言編寫一個簡單的學生成績管理系統

C語言程序：

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

typedefstructstudent
{
	charname[20];			/*姓名*/
	intcode;				/*學號*/
	intkor,eng,math;		/*3門課程的成績*/
}STUDENT;

/*返回輸入數據*/
STUDENTInput();

/*輸出所有輸入的數據*/
voidOutput(STUDENTinfo[],intcnt);

/*將輸入分數轉換為A-F*/
chargrade(intscore);

intmain()
{
	STUDENTS[10];
	intcnt=0,select;
	inti,j;
	intcode;

	while(1)
	{
		printf("	學生信息管理系統

");
		printf("		1	添加
");
		printf("		2	刪除
");
		printf("		3	查詢
");
		printf("		0	結束
");
		printf("		您的選擇[0-3]：");
		scanf("%d",&select);

		if(select<0||select>3)
			continue;
		if(select==0)
		{
			printf("退出系統!
");
			break;
		}

		if(select==1)			/*添加*/
		{			
			S[cnt++]=Input();
		}
		elseif(select==2)	/*刪除*/
		{
			printf("		待刪除學生的學號：");
			scanf("%d",&code);

			for(i=0;i<cnt;i++)
				if(S[i].code==code)
					break;
			if(i>=cnt)
			{
				printf("學號不存在，刪除失敗！
");
			}
			else{
				for(j=i+1;j<cnt;j++)
				{
					strcpy(S[j-1].name,S[j].name);
					S[j-1].code=S[j].code;
					S[j-1].kor=S[j].kor;
					S[j-1].eng=S[j].eng;
					S[j-1].math=S[j].math;
				}
				cnt--;
				printf("刪除成功！
");
			}
		}
		else					/*查詢*/
		{
			printf("		待查找學生的學號：");
			scanf("%d",&code);

			for(i=0;i<cnt;i++)
				if(S[i].code==code)
					break;
			if(i>=cnt)
			{
				printf("學號不存在，查找失敗！
");
			}
			else
			{
				printf("	查詢結果：
");
				Output(S,i);
			}
		}
	}

	return0;
}

/*返回輸入數據*/
STUDENTInput()
{
	STUDENTstu;
	printf("		新學生信息
");
	printf("		學號：");
	scanf("%d",&stu.code);
	printf("		姓名：");
	getchar();
	gets(stu.name);
	printf("		3門課程成績(以空格分隔)：");
	scanf("%d%d%d",&stu.kor,&stu.eng,&stu.math);

	returnstu;
}

/*輸出所有輸入的數據*/
voidOutput(STUDENTinfo[],intcnt)
{
	printf("學號：%d
",info[cnt].code);
	printf("姓名：");
	puts(info[cnt].name);
	printf("成績：%c%c%c
",grade(info[cnt].kor),grade(info[cnt].eng),grade(info[cnt].math));
}

/*將輸入分數轉換為A-F*/
chargrade(intscore)
{
	if(score<0||score>100)
		return'F';
	if(score>=90)
		return'A';
	if(score>=80)
		return'B';
	if(score>=70)
		return'C';
	if(score>=60)
		return'D';
	else
		return'E';
}

運行測試：

D. 學生成績管理系統c

資料庫基礎的課本上有例題啊

E. 用c語言做一個「學生成績管理系統」

/*
學生成績管理程序
編制一個統計學生考試分數的管理程序。
設學生成績已以一個學生一個記錄的形式存儲在文件中，
每位學生記錄包含的信息有：姓名，學號和各門功課的成績。
程序具有以下幾項功能：求出各門課程的總分，平均分，按姓名，
按學號尋找其記錄並顯示，瀏覽全部學生成績和按總分由高到低顯示學生信息等。
*/

#include <stdio.h>
#define SWN 3 /* 課程數 */
#define NAMELEN 20 /* 姓名最大字元數 */
#define CODELEN 10 /* 學號最大字元數 */
#define FNAMELEN 80 /* 文件名最大字元數 */
#define BUFLEN 80 /* 緩沖區最大字元數 */
/* 課程名稱表 */
char schoolwork[SWN][NAMELEN+1] = {"Chinese","Mathematic","English"};
struct record
{
char name[NAMELEN+1]; /* 姓名 */
char code[CODELEN+1]; /* 學號 */
int marks[SWN]; /* 各課程成績 */
int total; /* 總分 */
}stu;

struct node
{
char name[NAMELEN+1]; /* 姓名 */
char code[CODELEN+1]; /* 學號 */
int marks[SWN]; /* 各課程成績 */
int total; /* 總分 */
struct node *next; /* 後續表元指針 */
}*head; /* 鏈表首指針 */

int total[SWN]; /* 各課程總分 */
FILE *stfpt; /* 文件指針 */
char stuf[FNAMELEN]; /* 文件名 */

/* 從指定文件讀入一個記錄 */
int readrecord(FILE *fpt,struct record *rpt)
{
char buf[BUFLEN];
int i;
if(fscanf(fpt,"%s",buf)!=1)
return 0; /* 文件結束 */
strncpy(rpt->name,buf,NAMELEN);
fscanf(fpt,"%s",buf);
strncpy(rpt->code,buf,CODELEN);
for(i=0;i<SWN;i++)
fscanf(fpt,"%d",&rpt->marks[i]);
for(rpt->total=0,i=0;i<SWN;i++)
rpt->total+=rpt->marks[i];
return 1;
}
/* 對指定文件寫入一個記錄 */
writerecord(FILE *fpt,struct record *rpt)
{
int i;
fprintf(fpt,"%s\n",rpt->name);
fprintf(fpt,"%s\n",rpt->code);
for(i=0;i<SWN;i++)
fprintf(fpt,"%d\n",rpt->marks[i]);
return ;
}

/* 顯示學生記錄 */
displaystu(struct record *rpt)
{
int i;
printf("\nName : %s\n",rpt->name);
printf("Code : %s\n",rpt->code);
printf("Marks :\n");
for(i=0;i<SWN;i++)
printf(" %-15s : %4d\n",schoolwork[i],rpt->marks[i]);
printf("Total : %4d\n",rpt->total);
}

/* 計算各單科總分 */
int totalmark(char *fname)
{
FILE *fp;
struct record s;
int count,i;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return 0;
}
for(i=0;i<SWN;i++)
total[i]=0;
count=0;
while(readrecord(fp,&s)!=0)
{
for(i=0;i<SWN;i++)
total[i]+=s.marks[i];
count++;
}
fclose(fp);
return count; /* 返回記錄數 */
}

/* 列表顯示學生信息 */
void liststu(char *fname)
{
FILE *fp;
struct record s;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return ;
}
while(readrecord(fp,&s)!=0)
{
displaystu(&s);
printf("\n Press ENTER to continue...\n");
while(getchar()!='\n');
}
fclose(fp);
return;
}

/* 構造鏈表 */
struct node *makelist(char *fname)
{
FILE *fp;
struct record s;
struct node *p,*u,*v,*h;
int i;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return NULL;
}
h=NULL;
p=(struct node *)malloc(sizeof(struct node));
while(readrecord(fp,(struct record *)p)!=0)
{
v=h;
while(v&&p->total<=v->total)
{
u=v;
v=v->next;
}
if(v==h)
h=p;
else
u->next=p;
p->next=v;
p=(struct node *)malloc(sizeof(struct node));
}
free(p);
fclose(fp);
return h;
}

/* 順序顯示鏈表各表元 */
void displaylist(struct node *h)
{
while(h!=NULL)
{
displaystu((struct record *)h);
printf("\n Press ENTER to continue...\n");
while(getchar()!='\n');
h=h->next;
}
return;
}
/* 按學生姓名查找學生記錄 */
int retrievebyn(char *fname, char *key)
{
FILE *fp;
int c;
struct record s;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return 0;
}
c=0;
while(readrecord(fp,&s)!=0)
{
if(strcmp(s.name,key)==0)
{
displaystu(&s);
c++;
}
}
fclose(fp);
if(c==0)
printf("The student %s is not in the file %s.\n",key,fname);
return 1;
}

/* 按學生學號查找學生記錄 */
int retrievebyc(char *fname, char *key)
{
FILE *fp;
int c;
struct record s;
if((fp=fopen(fname,"r"))==NULL)
{
printf("Can't open file %s.\n",fname);
return 0;
}
c=0;
while(readrecord(fp,&s)!=0)
{
if(strcmp(s.code,key)==0)
{
displaystu(&s);
c++;
break;
}
}
fclose(fp);
if(c==0)
printf("The student %s is not in the file %s.\n",key,fname);
return 1;
}

main()
{
int i,j,n;
char c;
char buf[BUFLEN];
FILE *fp;
struct record s;
clrscr();
printf("Please input the students marks record file's name: ");
scanf("%s",stuf);
if((fp=fopen(stuf,"r"))==NULL)
{
printf("The file %s doesn't exit, do you want to creat it? (Y/N) ",stuf);
getchar();
c=getchar();
if(c=='Y'||c=='y')
{
fp=fopen(stuf,"w");
printf("Please input the record number you want to write to the file: ");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Input the student's name: ");
scanf("%s",&s.name);
printf("Input the student's code: ");
scanf("%s",&s.code);
for(j=0;j<SWN;j++)
{
printf("Input the %s mark: ",schoolwork[j]);
scanf("%d",&s.marks[j]);
}
writerecord(fp,&s);
}
fclose(fp);
}
}
fclose(fp);
getchar();
/*clrscr();*/
puts("Now you can input a command to manage the records.");
puts("m : mean of the marks.");
puts("t : total of the marks.");
puts("n : search record by student's name.");
puts("c : search record by student's code.");
puts("l : list all the records.");
puts("s : sort and list the records by the total.");
puts("q : quit!");
while(1)
{
puts("Please input command:");
scanf(" %c",&c); /* 輸入選擇命令 */
if(c=='q'||c=='Q')
{
puts("\n Thank you for your using.");
break; /* q，結束程序運行 */
}
switch(c)
{
case 'm': /* 計算平均分 */
case 'M':
if((n=totalmark(stuf))==0)
{
puts("Error!");
break;
}
printf("\n");
for(i=0;i<SWN;i++)
printf("%-15s's average is: %.2f.\n",schoolwork[i],(float)total[i]/n);
break;
case 't': /* 計算總分 */
case 'T':
if((n=totalmark(stuf))==0)
{
puts("Error!");
break;
}
printf("\n");
for(i=0;i<SWN;i++)
printf("%-15s's total mark is: %d.\n",schoolwork[i],total[i]);
break;
case 'n': /* 按學生的姓名尋找記錄 */
case 'N':
printf("Please input the student's name you want to search: ");
scanf("%s",buf);
retrievebyn(stuf,buf);
break;
case 'c': /* 按學生的學號尋找記錄 */
case 'C':
printf("Please input the student's code you want to search: ");
scanf("%s",buf);
retrievebyc(stuf,buf);
break;
case 'l': /* 列出所有學生記錄 */
case 'L':
liststu(stuf);
break;
case 's': /* 按總分從高到低排列顯示 */
case 'S':
if((head=makelist(stuf))!=NULL)
displaylist(head);
break;
default: break;
}
}
}

F. C語言：學生成績管理系統

/*首次使用，新建score.in文件，在裡面打入0
可用程序
#include<stdio.h>
FILE *fin
main()
{
fin=fopen("score.in","r");
fprintf(fin,"0");
return 0;
}
完成
*/
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<windows.h>
#include<time.h>
#define n 999
FILE *fin;
main()
{
int a[n]={0},ori=0,i=0,b=0,add[n]={0},con=0,orix[n]={0},t=0,te[n]={0},TRUEt,ixi,fx,abc=0,sum,TURE,xx;
long long f[n]={0},tex[n]={0};
printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t\t學生成績管理系統\n\t\t\t\t\t\t Please wait...");
Sleep(2000);system("cls");
int xp,xi;
fin=fopen("score.in","r+");
fscanf(fin,"%d",&xp);
i=xp;
for(xi=1;xi<=xp;xi++)
{fscanf(fin,"%d%d%d",&f[xi],&a[xi],&te[xi]);te[xi]--;
printf("Id:%lld score:%d ranking:%d\n",f[xi],a[xi],te[xi]+1);
add[xi]=xi;orix[xi]=a[xi];
}
fclose(fin);
int TRUE1;
pe:
while(1)
{ TRUE1=1;i++;
printf("Id(輸入-1:刪除,輸入-2:修改成績,輸入-3:刪除所有內容,輸入-4:保存到score.in並退出):");
scanf("%lld",&f[i]);
for(sum=1;sum<i;sum++)
if(f[sum]==f[i])
{system("cls");for(con=1;con<=i;con++) {if(a[con]==0)continue;printf("Id:%lld score:%d ranking:%d\n",f[con],a[con],te[con]+1);}TRUE1=0;i--;printf("Error with two same id.\n");continue;}
if(TRUE1==0)
continue;
if(f[i]==-3)
{int r;
for(r=0;r<n;r++)
{
a[r]=0;ori=0;i=0;b=0;add[r]=0;con=0;orix[r]=0;t=0;te[r]=0;abc=0;
f[r]=0;tex[r]=0;
}
system("cls");
goto pe;
}
if(f[i]==-2)
{TURE=0;i--;
system("cls");
for(con=1;con<=i;con++)
{if(a[con]==0)continue; printf("Id:%lld score:%d ranking:%d\n",f[con],a[con],te[con]+1);}
printf("修改學號_____________號的分數.\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",f[con],a[con],te[con]+1);
scanf("%d",&xx);
for(sum=1;sum<=i;sum++)
if(f[sum]==xx)
{
TURE=1;
printf("\n修改為___________.\b\b\b\b\b\b\b\b\b\b\b\b");
scanf("%d",&a[sum]);
printf("\n修改成功！將在下一次輸入後更新名次。\n\n");
continue;
}
if(TURE==0)
printf("No id is %d\n",xx);
continue;
}
if(f[i]==-4)
{
i--;
fin=fopen("score.in","r+");
fprintf(fin,"%d\n",i);
for(xi=1;xi<=i;xi++)fprintf(fin,"%d %d %d\n",f[xi],a[xi],te[xi]+1);
for(xi=i+1;xi<=xp;xi++)fprintf(fin," \n");
fclose(fin);
return 0;
}
if(f[i]==-1)
{TRUEt=0;
system("cls");
i--;
for(con=1;con<=i;con++){if(a[con]==0)continue;printf("Id:%lld score:%d ranking:%d\n",f[con],a[con],te[con]+1);}
printf("刪除學號_____________號.\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
scanf("%lld",&fx);
for(con=1;con<=i;con++)
if(f[con]==fx)
{TRUEt=1;abc++;
f[con]=0;
a[con]=0;
tex[abc]=te[con];
for(ixi=1;ixi<=i;ixi++)
if(te[ixi]>te[con])
te[ixi]--;
te[con]=0;
break;}
system("cls");
for(con=1;con<=i;con++){
if(a[con]==0)continue;
printf("Id:%lld score:%d ranking:%d\n",f[con],a[con],te[con]+1);}
if(TRUE==0)
printf("No Id is %lld\n",fx);
continue;
}
system("cls");
for(con=1;con<i;con++)
{if(a[con]==0)continue; printf("Id:%lld score:%d ranking:%d\n",f[con],a[con],te[con]+1);}
printf("Id:%lld score:",f[i]);
scanf("%d",&ori);system("cls");
a[i]=ori;add[i]=i;orix[i]=a[i];
system("cls");
for(b=1;b<=i;b++)
for(con=i;con>=b;con--)
if(orix[con]>orix[con-1])
{t=orix[con];orix[con]=orix[con-1];orix[con-1]=t;
t=add[con];add[con]=add[con-1];add[con-1]=t;}
for(con=1;con<=i;con++) te[add[con]]=con;
for(con=1;con<=abc;con++)
for(ixi=1;ixi<=i;ixi++)
if(te[ixi]>tex[con])
te[ixi]--;
if(te[i]==te[i-1])te[i]=0;
for(con=1;con<=i;con++)
{if(a[con]==0)continue;printf("Id:%lld score:%d ranking:%d\n",f[con],a[con],te[con]+1);}
}
return 0;
}

G. 學生成績管理系統C語言代碼

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

#define N 30
struct student
{
int num;
char name[20];
int age;
int Math;
int English;
int Physical;
long int sum;
}stu[N];

enter()
{int i,n;
printf("How many students(1-%d)?:",N);
scanf("%d",&n);
printf("\nEnter data now\n\n");
for(i=0;i<n;i++)
{printf("\n Input %dth student record.\n",i+1);
input(i);
}
if(i!=0) save(n);
printf_back(); /* browse or back */
}

add()
{int i,n,m,k;
FILE *fp;
n=load();
printf("How many students are you want to add(1-%d)?:",N-n);
scanf("%d",&m);
k=m+n;
for(i=n;i<k;i++)
{printf("\n Input %dth student record.\n",i+1);
input(i);
}
if((fp=fopen("score.txt","ab"))==NULL)
{printf("Cannot open file.\n");
}
for(i=n;i<k;i++)
if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)
printf("file write error.\n");
fclose(fp);
printf_back();
}

/* insert()
{int n,c;
struct student s;
n=load();
puts("\n Input one data.\n");
do
{input(n);
printf_face();
printf_one(n);
printf("\n\nAre you sure?\n\n\t 1.Sure\t2.cancel and again\t3.Back without save [ ]\b\b");
scanf("%d",&c);
if(c==1)
{
save(n+1);
printf_back();
}
else if(c!=2) menu();
}
while(c==2);
} */

modify()
{struct student s;
FILE *fp;
int i,n,k,w0=1,w1,w2=0;
n=load();
do
{
k=-1;
printf_face();
for(i=0;i<n;i++)
{if((i!=0)&&(i%10==0))
{printf("\n\nRemember NO.031073- which needed modify.Pass any key to continue ...");
getch();
puts("\n\n");
}
printf_one(i);
printf("\n");
}
do
{printf("\n\nEnter NO.031073- that you want to modify! NO.:031073-");
scanf("%d",&s.num);
for(i=0;i<n;i++)
if(s.num==stu[i].num)
{k=i;
s=stu[i]; /* chengji beifei */
}
if(k==-1) printf("\n\nNO exist!please again");
}
while(k==-1);
printf_face();
printf_one(k);
w1=modify_data(k,n);
if(w1==1)
{printf("\nSuccessful ^_^.\n\nAre you modify another?\n\n\t1.Yes2.Back with save\t[ ]\b\b");
scanf("%d",&w0);
w2=1;
}
else
{w0=0; /* end */
if(w2==1)
stu[k]=s;
}
if(w0!=1&&w2==1) save(n); /* w0!=1 return w2==1 modify */
}
while(w0==1);
menu();
}

delete()
{struct student s;
FILE *fp;
int i,n,k,w0=1,w1,w2=0;
n=load();
do
{
k=-1;
printf_face();
for(i=0;i<n;i++)
{if((i!=0)&&(i%10==0))
{printf("\n\nRemember NO.031073- which needed delete.Pass any key to continue ...");
getch();
puts("\n\n");
}
printf_one(i);
printf("\n");
}
do
{printf("\n\nEnter NO.031073- that you want to delete! NO.:031073-");
scanf("%d",&s.num);
for(i=0;i<n;i++)
if(s.num==stu[i].num)
{k=i;
s=stu[i]; /* chengji beifei */
}
if(k==-1) printf("\n\nNO exist!please again");
}
while(k==-1);
printf_face();
printf_one(k);
printf("\nAre you sure?\n\n\t1.Sure2.Back without save in this time [ ]\b\b");
scanf("%d",&w1);
if(w1==1)
{
stu[k].sum=0;
printf("\nSuccessful ^_^.\n\nAre you delete another?\n\n\t1.Yes2.Back with save\t[ ]\b\b");
scanf("%d",&w0);
w2=1;
}
else
{w0=0; /* end */
if(w2==1)
stu[k]=s;
}
if(w0!=1&&w2==1) save(n);
}
while(w0==1);
menu();
}

modify_score()
{struct student s;
FILE *fp;
int i,n,k,w0=1,w1,w2=0;
n=load();
do
{
k=-1;
printf_face();
for(i=0;i<n;i++)
{if((i!=0)&&(i%10==0))
{printf("\n\nRemember NO.031073 which score needed modify.Pass any key to continue ...");
getch();
puts("\n\n");
}
printf_one(i);
printf("\n");
}
do
{printf("\n\nEnter NO.031073- that you want to modify! NO.:031073-");
scanf("%d",&s.num);
for(i=0;i<n;i++)
if(s.num==stu[i].num)

{k=i;
s=stu[i]; /* chengji beifei */
}
if(k==-1) printf("\n\nNO exist!please again");
}
while(k==-1);
printf_face();
printf_one(k);
w1=modify_score1(k);
if(w1==1)
{printf("\nSuccessful ^_^.\n\nAre you modify another score?\n\n\t1.Yes2.Back with save\t[ ]\b\b");
scanf("%d",&w0);
w2=1;
}
else
{w0=0; /* end */
if(w2==1)
stu[k]=s;
}
if(w0!=1&&w2==1) save(n); /* w0!=1 return w2==1 modify */
}
while(w0==1);
menu();
}

order()
{int i,j,k,n;
struct student s;
n=load();
for(i=0;i<n-1;i++)
{k=i;
for(j=i+1;j<n;j++)
if(stu[j].num<stu[k].num) k=j;
s=stu[i];stu[i]=stu[k];stu[k]=s;
}
save(n);
puts("\n\n");
printf_back();
}

browse()
{int i,j,n;
n=load();
printf_face();
for(i=0;i<n;i++)
{if((i!=0)&&(i%10==0))
{printf("\n\nPass any key to contiune ...");
getch();
puts("\n\n");
}
printf_one(i);
printf("\n");
}
printf("\tThere are %d record.\n",n);
printf("\nPass any key to back...");
getch();
menu();
}

save(int n)
{FILE *fp;
int i;
if((fp=fopen("score.txt","wb"))==NULL)
{printf("\nCannot open file\n");
return NULL;
}
for(i=0;i<n;i++)
if(stu[i].sum!=0)
if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)
printf("file write error\n");
fclose(fp);
}

load()
{FILE *fp;
int i;
if((fp=fopen("score.txt","rb"))==NULL)
{printf("\nCannot open file\n");
return NULL;
}
for(i=0;!feof(fp);i++)
fread(&stu[i],sizeof(struct student),1,fp);
fclose(fp);
return(i-1);
}

no_input(int i,int n)
{int k,w1;
do
{w1=0;
printf("NO.:031073-");
scanf("%d",&stu[i].num);
if(stu[i].num<1 || stu[i].num>N)
{puts("Input error! Only be made up of(1-N).Please reinput!\n");
w1=1;
}
if(w1!=1)
for(k=0;k<n;k++)
if(k!=i&&(stu[k].num==stu[i].num))
{puts("This record is exist. Please reinput!\n");
w1=1;break;
}
}
while(w1==1);
}

enter_score(int i)
{printf("Math English Physical");
scanf("%d %d %d",&stu[i].Math,&stu[i].English,&stu[i].Physical);
}
sum(int i)
{
stu[i].sum=stu[i].Math+stu[i].English+stu[i].Physical;
}

input(int i)
{no_input(i,i);
printf("name: age:");
scanf("%s %d",stu[i].name,&stu[i].age);
enter_score(i);
sum(i);
}

modify_score1(int i)
{int c,w1;
do
{
puts("\nmodify by=>\n\n 1.Math 2.English 3.Physical4.all score 5.cancel and back");
printf("Which you needed?:[ ]\b\b");
scanf("%d",&c);
if(c>5||c<1)
{puts("\nChoice error! Please again!");
getchar();
}
}
while(c>5||c<1);
do
{switch(c)
{
case 1:printf("Math:");scanf("%d",&stu[i].Math);break;
case 2:printf("English:");scanf("%d",&stu[i].English);break;
case 3:printf("Physical:");scanf("%d",&stu[i].Physical);break;
case 4:enter_score(i);break;
case 5:break;
}
if(c>0&&c<5) sum(i);
puts("\nNow:\n");
printf_face();
printf_one(i);
printf("\nAre you sure?\n\n\t1.Sure 2.No and remodify3.Back without save in this time [ ]\b\b");
scanf("%d",&w1);
}
while(w1==2);
return(w1);
}

modify_data(int i,int n)
{int c,w1;
do
{
puts("\nmodify by=>\n\n 1.NO. 2.name 3.age 4.Math 5.English 6.Physical7.all score 8.all data 9.cancel and back");
printf("Which you needed?:[ ]\b\b");
scanf("%d",&c);
if(c>9||c<1)
{puts("\nChoice error! Please again!");
getchar();
}
}
while(c>9||c<1);
do
{switch(c)
{case 1:no_input(i,n);break;
case 2:printf("name:");scanf("%s",stu[i].name);break;
case 3:printf("age:");scanf("%d",&stu[i].age);break;
case 4:printf("Math:");scanf("%d",&stu[i].Math);break;
case 5:printf("English:");scanf("%d",&stu[i].English);break;
case 6:printf("Physical:");scanf("%d",&stu[i].Physical);break;
case 7:enter_score(i);break;
case 8:input(i);break;
case 9:break;
}
if(c>3&&c<8) sum(i);
puts("\nNow:\n");
printf_face();
printf_one(i);
printf("\nAre you sure?\n\n\t1.Sure 2.No and remodify3.Back without save in this time [ ]\b\b");
scanf("%d",&w1);
}
while(w1==2);
return(w1);
}

printf_face()
{printf("\nNO.031073 name age Math English Physical sum\n");
}

printf_one(int i)
{
printf("%6d %8s %4d",stu[i].num,stu[i].name,stu[i].age);
printf("%5d %5d %8d %10d",stu[i].Math,stu[i].English,stu[i].Physical,stu[i].sum);
}

printf_back()
{int k,w;
printf("\n\n\tSuccessful.^_^\n\n");
printf("What do you want to do?\n\n\t1.Browse all now\t2.Back:[ ]\b\b");
scanf("%d",&w);
if(w==1) browse();
else menu();
}
menu()
{int w1;
char n;
do
{
puts("\t\t****************MENU****************\n\n");
puts("\t\t\t\tA.Enter new data");
puts("\t\t\t\tB.Addition data");
puts("\t\t\t\tC.Modify data");
puts("\t\t\t\tD.Delete data");
puts("\t\t\t\tE.Modify score");
puts("\t\t\t\tF.Order by number");
puts("\t\t\t\tG.Browse all");
puts("\t\t\t\tH.Exit");
puts("\n\n\t\t************************************\n");
printf("Choice your number(A-H):[ ]\b\b");
n=getchar();
printf("\n");
if(n<'A'||n>'H')
w1=1;
else w1=0;
}
while(w1==1);
switch(n)
{case 'A':enter();break;
case 'B':add();break;
case 'C':modify();break;
case 'D':delete();break;
case 'E':modify_score();break;
case 'F':order();break;
case 'G':browse();break;
case 'H':exit(0);
}
}
char password[7]="123456";
main()
{
char s[7];
printf("\t\t請輸入密碼:\n\t\t\n\t\t");
scanf("%s",s);
if(!strcmp(s,password))
{
printf("\n\t\t恭喜你進入學生成績管理系統\n");
menu();
}
else
{
printf("\t\t 密碼錯誤\n\n");
main();
}
}

H. 用C語言編寫一個學生成績管理系統。

#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****學生成績管理系統****\n"); /*菜單選擇*/
printf("\t\t | 1. 輸入學生信息|\n");
printf("\t\t | 2. 顯示學生信息 |\n");
printf("\t\t | 3. 排序 |\n");
printf("\t\t | 4. 增添學生信息 |\n");
printf("\t\t | 5. 刪除學生信息 |\n");
printf("\t\t | 6. 查詢 |\n");
printf("\t\t | 7. 統計 |\n");
printf("\t\t | 0. 退出 |\n");
printf("\t\t*****************************************\n");
printf("\t\t\t請選擇操作(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\t學號:"); /*交互輸入*/
scanf("\t\t\t%s",stud[n+i].num);
printf("\t\t\t學生姓名:");
scanf("\t\t\t%s",stud[n+i].name);
printf("\t\t\t學生成績:");
scanf("\t\t\t%d",&stud[n+i].score);
gets(x); /*清除多餘的輸入*/
printf("\t\t\t需要輸入更多信息？(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\t學號\t\t姓名\t\t成績\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\t學號:"); /*互動式輸入*/
scanf("\t\t\t%s",stud[n].num);
printf("\t\t\t學生姓名:");
scanf("\t\t\t%s",stud[n].name);
printf("\t\t\t學生成績:");
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\t添加成績信息!\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\t請輸入所要刪除數據的姓名:"); /*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\t未找到數據!\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\t刪除結束!\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\t請輸入您所查找的學生姓名:"); /*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\t未找到!\n"); /*輸入失敗信息*/
return;

}
printf("\t\t\t學號是:%s\n",stud[i].num); /*輸出該學生信息*/
printf("\t\t\t成績是:%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\t總共有 %d 條信息.\n",n); /*總共記錄數*/
printf("\t\t\t最高分:\n"); /*最高分*/

printf("\t\t\t學號:%s 姓名:%s 成績:%d\n",stud[j].num,stud[j].name,stud[j].score);
printf("\t\t\t最低分:\n"); /*最低分*/
printf("\t\t\t學號:%s 姓名:%s 成績:%d\n",stud[k].num,stud[k].name,stud[k].score);
printf("\t\t\t平均分 %5.2f\n",aver); /*平均分*/
}

void main() /*主函數*/
{
int n=0;
for(;;)
{
switch(menu_select()) /*選擇判斷*/
{
case 1:
printf("\t\t\t輸入學生信息\n"); /*輸入若干條記錄*/
n=Input(stu,n);
break;
case 2:
printf("\t\t\t顯示所有學生信息\n"); /*顯示所有記錄*/
Display(stu,n);
break;
case 3:
printf("\t\t\t排序\n");
Sort_by_num(stu,n); /*按學號排序*/
printf("\t\t\t排序結束!\n");
printf("\t\t\t");
system("pause");
break;
case 4:

printf("\t\t\t增添學生信息\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\t刪除一個學生信息\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\t查詢\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\t統計\n");
Statistic(stu,n); /*新增功能，輸出統計信息*/
printf("\t\t\t");
system("pause");
break;
case 0:
printf("\t\t\t程序結束\n"); /*結束程序*/
printf("\t\t\t");
system("pause");
exit(0);
}
}
}

I. 用c語言實現一個簡單的學生成績管理系統，包括：學號，姓名，科目，成績

//用字元界面實現，比如按數字1，可以錄入學生所有信息；
//按數字2，顯示所有學生成績；
//按數字3，進入查詢，按學號或姓名查詢該學生是否存在，如果存在顯示他的所有信息，///否則給出不存在提示。
#include<stdio.h>
structstudent
{
charnum[6];/*學號*/
charname[10];
charsubject[20];/*科目*/
floatgrade;
}stu[10];
voidmenu()
{
printf("====================================
");
printf("|學生成績管理系統|
");
printf("|1輸入學生成績|
");
printf("|2輸出學生成績|
");
printf("|3查詢學生成績|
");
printf("|0退出管理系統|
");
printf("====================================
");
}
voidinput()
{
for(inti=0;i<10;i++)
scanf("%s%s%s%f",stu[i].num,stu[i].name,stu[i].subject,&stu[i].grade);
}
voidshow()
{
printf("學號	姓名	科目	成績
");
for(inti=0;i<10;i++)
printf("%s	%s	%s	%f
",stu[i].num,stu[i].name,stu[i].subject,stu[i].grade);
}
voidserach()
{
charobj[10];
printf("輸入要查詢的學號");
scanf("%s",obj);
for(inti=0;i<10;i++)
{
if(strcmp(obj,stu[i].num))
{
printf("學號	姓名	科目	成績
");
printf("%s	%s	%s	%f
",stu[i].num,stu[i].name,stu[i].subject,stu[i].grade);
}
}
}
intmain()
{
intselection;
while(true)
{
clrscr();
menu();
printf("請選擇0--3:");
scanf("%d",&selection);
switch(selection)
{
case1:input();break;
case2:show();break;
case3:search();break;
case0:exit(0);break;
default:printf("錯誤的輸入，請重新輸入：");
}
}
return0;
}