C++学习笔记（五）

枚举类型 enum

enum color {red, yellow, blue, black};  //red = 0,yellow = 1,blue = 2
//black = 3

color test;
test = blue;

int a = blue;       //valid
test = 3;           //invalid
a = 3 + red;        //valid
test = color(3);    //valid，强制类型转换

enum bigstep {first, second = 100, third};  //first = 0, second = 100,
//third = 101