#include <iostream>
using namespace std;
int main(){
    enum color{red,yellow,blue,white,black};
    int i=0;
    int j=0;
    int k=0;
    for(;i<5;i++){
        for(;j<5;j++){
            for(;k<5;k++){
                if(!(i==j)&&!(j==k))
                {cout<<(color)i<<" ";
                cout<<(color)j<<" ";
                cout<<(color)k<<" "<<endl;
                }
            }
        }
    }
    return 0;
}

vc6.0不支持赋值放在循环里面啊 另外控制条件的意思是说任意两个值不相等