enum

enum 枚举类型，声明符号名称来表示整形常量，占一个int类型的大小

enum COLOR 
{
	RED, BLUE, PINK, BLACK,GREY
};

int main(int argc, char* argv[])
{

	enum COLOR a;
	cout <<sizeof(a)<<endl;
	cout<<RED<<endl;
	cout<<BLUE<<endl;
	cout<<PINK<<endl;
	cout<<BLACK<<endl;
	return 0;
}

如果不给定初值，那么枚举类型的值从0 - n-1
枚举所占内存大小为4

如果给某个符号名称赋一个初值 N，这个符号名称后面的值为N+1 N+2 N+3…

enum COLOR 
{
	RED, BLUE = 10, PINK, BLACK,GREY
};

int main(int argc, char* argv[])
{

	enum COLOR a;
	cout <<sizeof(a)<<endl;
	cout<<RED<<endl;
	cout<<BLUE<<endl;
	cout<<PINK<<endl;
	cout<<BLACK<<endl;
	return 0;
}

---

enum COLOR 
{
	RED, BLUE = 10, PINK, BLACK = 1,GREY
};

int main(int argc, char* argv[])
{

	enum COLOR a;
	cout <<sizeof(a)<<endl;
	cout<<RED<<endl;
	cout<<BLUE<<endl;
	cout<<PINK<<endl;
	cout<<BLACK<<endl;
	cout<<GREY<<endl;
	return 0;
}