#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
 
struct ziliao{
    char name[10];
    int xuehao;
    int com;
    int math;
    int eng;
    int sum;
    float ave;
};struct ziliao date[40];
  int abc=0;
void toscanf();
void tosum();
void toave();
void toavesum();
void tomax();
void tomin();
void torank();
void toall();
void toscanf();
void caidan();
main(){
    int x;
    while(1);
    {  caidan();
        scanf("%d",&x);
switch(x){
case 1:toscanf();
break;
case 2:tosum();
    break;
case 3:toave();
    break;
case 4:toavesum();
    printf("按任意键继续...");
    getch();
    break;
case 5:tomax();
    printf("按任意键继续...");
    getch();
    break;
case 6:tomin();
    printf("按任意键继续...");
    getch();
    break;
case 7:torank();
    break;
case 8:toall();
    printf("按任意键继续...");
    getch();
    break;
case 0:exit(0);
default: printf("操作错误，请重新输入0~8：\n");
    printf("---------------------------------------\n");
}
}
}
void caidan()
{      system("cls");
        printf("===================================================\n");
    printf("\t1.添加学生资料\n");
    printf("\t2.计算每个学生的总分\n");
    printf("\t3.计算每个学生的平均分\n");
    printf("\t4.输出平均总分\n");
    printf("\t5.输出最高总分\n");
    printf("\t6.输出最低总分\n");
    printf("\t7.按照学生的总分进行从高到低排序\n");
    printf("\t8.输出所有学生信息\n");
    printf("\t0.退出系统\n");
    printf("===================================================\n");
    printf("\n输入您的选择：");
    }
void toscanf1()
{   abc++;
    printf("输入学号\n");
   scanf("%d",&date[abc-1].xuehao);

   printf("输入姓名\n");
   scanf("%s",&date[abc-1].name[10]);


   printf("输入计算机成绩\n");
   scanf("%d",&date[abc-1].com);

printf("输入数学成绩\n");
   scanf("%d",&date[abc-1].math);

   printf("\n");
   scanf("输入英语成绩%d",&date[abc-1].eng);
   
   printf("\n");
   scanf("输入总分%d",&date[abc-1].sum);

   printf("\n");
   scanf("输入平均分%d",&date[abc-1].ave);
}
 
void toscanf()
{int y;
while(1)
{    system("cls");
     printf("返回上一层目录请按：0\n");
     printf("继续请按：1\n");
     printf("请输入您的选择：\n");
     scanf("%d",&y);
switch(y){
case 0:return;
    break;
case 1:toscanf1();
    break;
default:printf("请您输入正确的0~1的数字:\n");
}
}
}
void toall()
    {int i;
struct ziliao st;
printf("-----------------------");
for(i=0;i<abc;i++)
{st=date[i];
printf("\n输出学号:%d",st.xuehao);
printf("\n输出姓名:%d",st.name);
printf("\n输出计算机成绩:%d",);
printf("\n输出数学成绩:%d",st.math);
printf("\n输出英语成绩:%d",st.eng);
printf("\n输出总分:%d",st.sum);
printf("\n输出平均分:%d",st.ave);
printf("------------------------");
}
}
void tosum()
 {int i;
 for(i=0;i<40;i++)
    {date[i].sum=date[i].com+date[i].math+date[i].eng;
 }
 }

void toave()
 {int i;
     for(i=0;i<40;i++)
     {date[i].ave=(date[i].com+date[i].math+date[i].eng)/3.0;
 }
 }
void toavesum()
 {int i;
 int sum1=0;
 float avesum;
 void tosum();
 for(i=0;i<40;i++)
    sum1+=date[i].sum;
 avesum=sum1/(i+1);
printf("%f",avesum);
}
void tomax()
 {int i,t,max;
     for(i=0;i<39;i++)
     {if(date[i+1].sum>=date[i].sum)
         t=date[i].sum;
         date[i].sum=date[i+1].sum;
        date[i+1].sum=t;
         max=date[i].sum;}
         printf("%d",max);
 }
void tomin()
 {int t,i,min;
     for(i=0;i<39;i++)
         if(date[i+1].sum<=date[i].sum)
              t=date[i].sum;
         date[i].sum=date[i+1].sum;
         date[i+1].sum=t;
         min=date[i].sum;
         printf("%d",min);
 }
void torank()
 {int i,j;
int t;
        for(i=0;i<39;i++)
        {for(j=i+1;j<38;j++)
        {if(date[j].sum >date[i].sum)
         t=date[j].sum;
         date[j].sum=date[i].sum;
         date[i].sum=t;
        }
}
}





[ 本帖最后由 晴天一阵 于 2011-6-20 14:13 编辑 ]

main中while(1)后面多了一个分号，去掉分号即可。

结贴吧，给我分

谢谢