枚举类型例题：口袋中有红、黄、蓝、白、黑5种颜色的球若干个。每次从口袋中先取出3个球，问得到3种不同色的球的可能取法，打印出各种排列的情况。

#include<stdio.h>
int main(void)
{
    enum Color {red,yellow,blue,white,black};
    int i,j,k;
    int n=0,pri,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=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 is:%d\n",n);
}