c: 排列5选3

#include<stdio.h>
#include<stdlib.h>
char* getStrBall(int a){
	switch(a){
	case 0:
		return "red";
	case 1:
		return "yellow";
	case 2:
		return "blue";
	case 3:
		return "white";
	case 4:
		return "black";
	}
}
int main(void){
	enum ball{red,yellow,blue,white,black};
	enum ball first_ball,sec_ball,third_ball;
	int i,j,k,n=0;
	for(i=0;i<5;i++){
		char * first_ball_str = getStrBall(i);
		//printf("%s ",first_ball_str);
		//printf("i:%d ",i);
		for(j=0;j<5;j++){
			if(i!=j){
				char * second_ball_str = getStrBall(j);
				//printf("%s ",second_ball_str);
				//printf("j:%d ",j);
				for(k=0;k<5;k++){
					if(i!=k&&j!=k){
						char * third_ball_str = getStrBall(k);
						
						
						//char * third_ball_str = getStrBall(k);
						printf("%-10s ",first_ball_str);
						printf("%-10s ",second_ball_str);
						printf("%-10s ",third_ball_str);
						n++;
						printf("n:%d ",n);
						printf("\n");
					}
				}
			}
		}
		printf("\n");
	}
	system("pause");
}