口袋中有紅、黃、藍3種顏色的小球，如果每次從口袋中取出2種不同顏色的小球，編寫程式，打印出每種組合。

#include <iostream>
#include <string>
using namespace std;
int main()
{
	enum color { red, yellow, blue };
	int temp, i, j;
	for (i = red; i <= yellow; i++)
	{
		for (j = i + 1; j <= blue; j++)
		{
			for (int t = 0; t<2; t++)//控制輸出
			{
				switch (t) 
				{
				case 0: temp = i; break;
				case 1: temp = j; break;
				}
				switch ((enum color)temp)
				{
				case red: cout << "red" << "\t"; break;
				case yellow: cout << "yellow" << "\t"; break;
				case blue: cout << "blue" << "\t"; break;
				}
			}
			cout << "\n";
		}
	}
	return 0;
}