void xuanke_information()//统计选课情况
{
int mai_n();
int total=0;
int a;
FILE *fp;
struct student s;
if((fp=fopen("student.txt","r"))==NULL)//文件没有内容报错 
{
printf("\nCannot open student!\n");
}
printf(" 学号 课程编号 课程名称\n");
for(;!feof(fp);)
{fscanf(fp,"%d%d%s\n",&s.snum,&s.cnum,&s.cname);
total++;
printf("%7d%9d%13s\n",s.snum,s.cnum,s.cname);
}
printf("\n 选课学生总人数为：%d 人",total);
fclose(fp);
printf("\n1-返回菜单；2-退出系统\n");
scanf("%d",&a);system("cls");//清屏
if(a==1)
mai_n();
else
exit(0);
}