枚举、联合

# include <iostream.h>

int main()
{
	//枚举类型变量的取值范围：Mon~Sun 
	enum Week {Mon = 1, Tue, Wed, Thu = 11, Fri, Sat, Sun};
	Week wk;
	wk = Fri;
	cout << wk << endl;		//output: 12
	
	//联合在同一时间只能存储一个成员的值 
	union Choise {
		int id;
		char name[16];
	};
	Choise ch;
	ch.id = 7777;
	strcpy(ch.name, "zlj");
	cout << ch.name << endl;	//output: zlj 
	cout << ch.id << endl;		//output: 无意义（ch存储的是name的值） 
	cout << sizeof(Choise) << endl;		//output: 16（char name[16]的大小） 

	return 0;
}