口袋中有red,yellow,blue,white,black 五种颜色的球若干个，每次从口袋中先后取出3个球，问得到3种不同颜色的球的可能取法，输出每种排列的情况。

自己写的程序如下，可是总有error运行不了，求高人指点。

#include <stdio.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;
}