int insRec()
{
    int a;
    STUSCALE *ps,*stu;
    FILE *fp;
    printf("请按顺序输入下列一下各项的值，各值之间以Tab键隔开:\n");
    ps=(STUSCALE*)malloc(sizeof(STUSCALE));
    stu=(STUSCALE*)malloc(sizeof(STUSCALE));
    while(1)
    {
            a=0;
            printf("\n学号\t姓名\t数学\t英语\t语文\n");
            scanf("%ld%s%f%f%f",&(ps->stuno),&(ps->sname),&(ps->maths),&(ps->english),&(ps->chinese));
            ps->isdeleted=0;
            fp=fopen("c:\\stu.dat","wb+");
            fread(stu,sizeof(STUSCALE),1,fp);
            while(!feof(fp))
            {
                 if(ps->stuno==stu->stuno&&stu->isdeleted==0)
                 {
                      printf("错误：学号已重复，请输入正确的学号:\n ");
                      a=1;
                      break;
                 }
                 fread(stu,sizeof(STUSCALE),1,fp);               
            }
            fclose(fp);
        if(a==0) break;
    }
       fp=fopen("c:\\stu.dat","ab");
    fwrite(ps,sizeof(STUSCALE),1,fp);
    fclose(fp);
}