#include<stdio.h>
main()
{
    enum fruit{apple,orange,banana,pinapple,pear};
    enum fruit x,y,z,pri;
    int n, loop;
    n=0;
    for(x=apple;x<=pear;x++)
        for(y=apple;y<=pear;y++)
         if(x!=y)
            {
                for(z=apple;z<=pear;z++)
                 if((z!=x)&&(z!=y))
                  n++;
                  printf("\n%-4d",n);
         for(loop=1;loop<=3;loop++)
                {
                    switch(loop)
                    {
                        case1:  pri=x;    break;
                        case2:  pri=x;    break;
                        case3:  pri=z;    break;
                        default:          break;
                    }
                     switch(pri)
                     {
                        case apple:     printf("%-8s","apple");      break;
                        case orange:    printf("%-8s","orange");     break;
                        case banana:    printf("%-8s","banana");     break;
                        case pinapple:  printf("%-8s","pinapple");   break;
                        case pear:      printf("%-8s","pear");       break;
                        default:                                     break;
                     }

                }
printf("\ntotal  %d",n);
            }

}

最好不要使用loop语句

楼上,教教我enum怎么使用,我没学过,准备学.

应该是case0开始的么？

case 是从1开始的，但是应该是空格，也就是  case 1：

我也不会，我也是新手，尽量给你调试一下吧

哦..

My god,你的  case2:  pri=x;    break; 里面的pri=x应该是pri=y吧？