//enum枚举类型

#include<stdio.h>
void enumTest();
void main()
{
	enumTest();//枚举类型举例
	printf("\n排列问题，5球取三球，不重色\n");
	enum color{red,yellow,blue,white,black};
	int i,j,k,pri;//注意是int类型
	int n,loop;
	n=0;
	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 0:printf("%-10s","red");break;
								case 1:printf("%-10s","yellow");break;
								case 2:printf("%-10s","blue");break;
								case 3:printf("%-10s","white");break;
								case 4:printf("%-10s","black");break;
								default:break;
							}
						}
						printf("\n");
					}
			}
			printf("\ntoatal=%5d\n",n);
}

//枚举类型小例子
void enumTest()
{
	void showColor(int);
	enum color{red,green,blue,white,black}j,k;//枚举元素，枚举常量从0开始编号，递增
	int i=(enum color)0;
	j=(enum color)1;
	k=(enum color)2;
	showColor(i);
	showColor(j);
	showColor(k);
	for(i=red;i<=black;i++)//i不能定义为enum color类型，若定义为此类型，i++报错
	{
		printf("i=%d\t",i);
		showColor(i);
	}
	enum week{sunday=1,monday,tuesday}w;//递增编号
	w=monday;
	printf("monday=%d\n",w);
}
void showColor(int n)
{
	printf("%d\t",n);
	switch(n)
	{
		case 0:printf("red\n");break;
		case 1:printf("green\n");break;
		case 2:printf("blue\n");break;
		case 3:printf("white\n");break;
		case 4:printf("black\n");break;
		default:break;
	}
}

c语言——枚举类型