#include <stdio.h>
#include <stdlib.h>
#include<conio.h>
#include<dos.h>
#include<string.h>
#define LEN sizeof(struct student)
#define FORMAT "%-10d%-15s%-12.1ls%-12.1ls%-12.11s%\n"
#define DATA stu[i].num,stu[i].name,stu[i].shijian,stu[i].liyou,stu[i].xuke
void menu();
struct student
{
  int num;
  char name[15];
  char shijian;
  char liyou;
  char xuke;
};
struct student stu[50];
void chakan();
void qingjia();
int main()
{

    int n;
    menu();
    scanf("%d",&n);
    while(n)
    {
        switch(n){
        case 1:qingjia();
        break;
        case 3:chakan();
        break;
        default:
        break;
        }
        getch();
    menu();
    scanf("%d",&n);
    }
    return 0;
}
void menu()
{
  printf("\n\n\n\n\n");
  printf("\t\t|---------------------STUDENT------------------------|\n");
  printf("\t\t|\t 0. exit                                     |\n");
  printf("\t\t|\t 1. Student Interface                        |\n");
  printf("\t\t|\t 2. Administrator Interface                  |\n");
  printf("\t\t|\t 3. Teacher Interface                        |\n");
  printf("\t\t|----------------------------------------------------|\n\n");
  printf("\t\t\tchoose(0-3):");
}

void qingjia()
{
 int i,m=0;
  char ch[20];
  FILE *fp;
  if((fp=fopen("data.txt","a+"))==NULL)
     {
         printf("不能打开\n");
     return;
     }
  while(!feof(fp)) {
   if(fread(&stu[m] ,LEN,1,fp)==1)
    m++;
  }
  fclose(fp);
  if(m==0)
   printf("没有记录!\n");
  else
  {
   system("cls");
          chakan();
  }
  if((fp=fopen("data.txt","wb"))==NULL)
     { printf("不能打开\n");
     return;}
  for(i=0;i<m;i++)
  {
   fwrite(&stu[i] ,LEN,1,fp);
  }
    printf("请输入(y/n):");
    scanf("%s",ch);
while(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)
    {
  printf("请输入学号:");
  scanf("%d",&stu[m].num);/*输入学生学号*/
        for(i=0;i<m;i++)
   if(stu[i].num==stu[m].num)
   {
    printf("此学号已存在，按任意键继续!");
    getch();
    fclose(fp);
    return;
   }
   printf("姓名:");
   scanf("%s",stu[m].name);
   getchar();
   printf("请假理由:");
   scanf("%s",&stu[m].liyou);
   getchar();
   printf("请假时间:");
   scanf("%s",&stu[m].shijian);
   getchar();
   printf("是否许可:");
   scanf("%s",&stu[m].xuke);
   getchar();
     if(fwrite(&stu[m],LEN,1,fp)!=1)/*将新录入的信息写入指定的磁盘文件*/
       { printf("不能保存!"); getch(); }
     else { printf("%s 已保存!\n",stu[m].name);m++;}
     printf("是否继续?(y/n):");/*询问是否继续*/
     scanf("%s",ch);
  }
  fclose(fp);
  printf("OK!\n");
 }


void chakan()
 { FILE *fp;
   int i,m=0;
   fp=fopen("data.txt","rb");
   while(!feof(fp))
   {
   if(fread(&stu[m] ,LEN,1,fp)==1)
   m++;
   }
   fclose(fp);
   printf("number    name           liyou    shijian     xuke \t\n");
   for(i=0;i<m;i++)
       {
    printf(FORMAT,DATA);//
       }
       }

但是从文件里输出数据却出现错误。。。

但是错在哪里呢？！~

但为什么会出现exe停止工作？~