ex3_19.cpp

纯粹是学习专用～

#include<iostream.h>
#include<iomanip.h>
void main(){
	enum color_set {red,yellow,blue,white,black};
	color_set color;
	int i,j,k,counter=0,loop;
	for(i=red;i<=black;i++)
		for(j=red;j<=black;j++)
			if(i!=j){						//前两个球颜色不同
				for(k=red;k<=black;k++)
					if(k!=i&&k!=j){		//第三个球不同于前两个，满足要求
						counter++;
						if((counter)%22==0){
							cout<<"请按回车键继续";
							cin.get();
						}
						cout<<setw(15)<<counter;
						/*下面输出每种取法，一行为一种取法的三个颜色*/
						for(loop=1;loop<=3;loop++){
							switch(loop){
							case 1: color=(color_set) i; break;	//第一个是i
							case 2: color=(color_set) j; break;	//第二个是j
							case 3: color=(color_set) k; break;	//第三个是k
							}
							switch(color){
							case red:   cout<<setw(15)<<"red";   break;
							case yellow:cout<<setw(15)<<"yellow";break;
							case blue:  cout<<setw(15)<<"blue";  break;
							case white:	cout<<setw(15)<<"white"; break;
							case black: cout<<setw(15)<<"black"; break;
							}
						}
						cout<<endl;			//输出一种取法后换行
					}
			}
			cout<<"共有："<<counter<<"种取法"<<endl;
}