#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#define N 10
struct student
{
int num;
char name[12];
char sex[4];
char clas[20];
int a,b,c;
double pjf;
};

void main()
{
void shuru(struct student stu[N]);
void chuli(struct student stu[N]);
void xiugai(struct student stu[N]);
void shuchu(struct student stu[N]);
void paixu(struct student stu[N]);
void chaxun(struct student stu[N]);
void tongj(struct student stu[N]);
double pjf(struct student stu[N]);
void bjgkm(struct student stu[N]);
struct student stu[N];
int i=0,j=0,p=0,u=0;
char str[70][500];
FILE *fp1,*fp;
if((fp=fopen("学生信息.txt","r"))==NULL)
printf("注意：为免出错，第一次使用本程序，请选1 手动输入数据. \n");
else
{
for(i=1;i<=N;i++)
{
if(i==1)
fp=fopen("学生信息.txt","r");
fscanf(fp,"%d%s%s%s%d%d%d",&stu[i].num,stu[i].name,stu[i].sex,stu[i].clas,&stu[i].a,&stu[i].b,&stu[i].c);
if(1==N)
fclose(fp);
}
}
char choice;
do{
for(i=0;i<14;i++)
printf("**");
printf("主菜单");
for(j=0;j<14;j++)
printf("**");
printf("\n");
printf("#请选择： 1 数据输入 2 数据修改 3 数据处理 4 数据输出 5 退出#\n");
for(i=0;i<20;i++)
printf("***");
printf("**\n");
scanf("%d",&choice);
switch(choice)
{
case 1 :
shuru(stu) ; break;
case 2 :
xiugai(stu) ; break;
case 3 :
chuli(stu) ; break;
case 4 :
shuchu(stu) ; break;
case 5 : break;
default : puts("error"); return;
}

} while(choice!=5);
fp1=fopen("学生信息.txt","w");
for(i=1;i<=N;i++)
{

fprintf(fp1,"%d ",stu[i].num);
fprintf(fp1,"%s ",stu[i].name);
fprintf(fp1,"%s ",stu[i].sex);
fprintf(fp1,"%s ",stu[i].clas);
fprintf(fp1,"%d ",stu[i].a);
fprintf(fp1,"%d ",stu[i].b);
fprintf(fp1,"%d ",stu[i].c);
fprintf(fp1,"\n");
}
puts("信息已保存在“学生信息.txt”中 Thank you！！");
fclose(fp1);
}