enum

//在用枚举的时候总觉得很迷惑//为什么枚举里的值在定义的外面就可以直接使用了呢？//例如：enum computer{lenovo，asus}；//compzuoyouter c = asus;//ASUS直接就可以使用而不需要c=computer::asus;//原来enum的{}没有作用域的作用//如果你在相同的作用域中定义：/*enum computer{lenovo，asus}；enum computer2{lenovo，asus}；会出现重复定义的错误*/#include <iostream>using namespace std;class Lenovo{public:    Lenovo(){ cout << "a Lenovo computer created" << endl; }    ~Lenovo(){ cout << "a Lenovo computer destoryed" << endl; }    enum value{low=1000,high=5000};    void show(){ cout << "Leenovo" << endl; }};enum value2{ low = 100, high = 5000 };//enum value3{ low = 1000, high = 5000 };int main(){    value2 d = low;    Lenovo create;;    cout << create.low << endl;    cout << Lenovo::low << endl;    cout << d << endl;    return 0;}