#include <stdio.h> #include <stdlib.h> int main() { enum Color {red,yellow,blue,white,black}; enum Color i,j,k,pri; int n,loop; n=0; for(i=red;i<=black;i++) for(j=red;j<=black;j++) if(i!=j) { for (k=red;k<=black;k++) if((k!=i)&&(k!=j)) { n=n+1; printf("%-4d",n); for(loop=1;loop<=3;loop++) { switch(loop) { case1: pri=i;break; case2: pri=j;break; case3: pri=k;break; default:break; } switch(pri) { case red:printf("%-10s","red");break; case yellow:printf("%-10s","yellow");break; case blue:printf("%-10s","blue");break; case white:printf("%-10s","white");break; case black:printf("%-10s","black");break; default:break; } } printf("\n"); } } printf("\ntotal:%5d\n",n); return 0; }哪里错了

代码中的问题是在第23行，case1应该改为case 1，因为case后面的值应该是一个整数，而不是一个标识符。同样的问题也存在于case2和case3中。修改后的代码如下：

#include <stdio.h> 
#include <stdlib.h>  

int main() {     
    enum Color {red,yellow,blue,white,black};     
    enum Color i,j,k,pri;     
    int n,loop;     
    n=0;     
    for(i=red;i<=black;i++)         
        for(j=red;j<=black;j++)             
            if(i!=j)             
            {                 
                for (k=red;k<=black;k++)                     
                    if((k!=i)&&(k!=j))                 
                    {                     
                        n=n+1;                     
                        printf("%-4d",n);                     
                        for(loop=1;loop<=3;loop++)                     
                        {                         
                            switch(loop)                         
                            {                             
                                case 1: pri=i;break;                             
                                case 2: pri=j;break;                             
                                case 3: pri=k;break;                             
                                default:break;                         
                            }                         
                            switch(pri)                         
                            {                             
                                case red:printf("%-10s","red");break;                             
                                case yellow:printf("%-10s","yellow");break;                             
                                case blue:printf("%-10s","blue");break;                             
                                case white:printf("%-10s","white");break;                             
                                case black:printf("%-10s","black");break;                             
                                default:break;                           
                            }                     
                        }                     
                        printf("\n");                 
                    }             
            }   
    printf("\ntotal:%5d\n",n); 
    return 0;   
}