c++ 枚举类型

定义

• 枚举的一般形式

  enum 枚举类型名 {标识符列表};
  enum weekday {Sunday,Monday,Thesday,Wednesday,Thursday,Friday,Saturday};
  

• 带赋值的枚举类型

  enum 枚举类型名
  {
    标识符 [=整型常数],
    ...
    标识符 [=整型常数],
  }枚举变量;
  enum weekday
  {
    Sunday = 0,
    Monday = 1,
    Thesday = 2,
    Wednesday = 3,
    Thursday = 4,
    Friday = 5,
    Saturday = 6
  };
  

运算

枚举值相当于整型变量

• 判断比较
• 利用枚举类型做加减法运算,枚举值可以直接进行加减法运算

    enum weekday
    {
        Sunday = 0,
        Monday = 1,
        Thesday = 2,
        Wednesday = 3,
        Thursday = 4,
        Friday = 5,
        Saturday = 6
    };
  
    weekday m_week1;
    weekday m_week2;
    weekday m_week3;
    m_week1 = Saturday;
    m_week2 = Monday;
    m_week3 = Thesday;
    cout << m_week1 - m_week2 << endl;
    cout << m_week2 + m_week3 << endl;