#include<stdio.h>
int main()
{
    enum Color{red,yellow,blue,white,black};
    enum Color i,j,k,pri;
    int n=0;
    int loop;
    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+=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;
}
书上的例题。怎么运行不了呢？帮忙指导一下。谢谢！