[C++] C语言学习之枚举类型

enum 枚举名
{
  枚举值表
};

enum weekday
{
  Mon, Tues, Wed,  Thurs, Fri, Sat, Sun
};

enum weekday
{
  Mon = 0,
  Tues = 1,
  Wed = 2,
  Thurs = 3,
  Fri = 4,
  Sat = 5,
  Sun = 6
};

enum weekday
{
  Mon = 0,
  Tues,
  Wed,
  Thurs,
  Fri,
  Sat,
  Sun
};

enum weekday{sun,mon,tue,wed,thu,fri,sat};  //定义枚举类型
enum weekday a,b,c;       //定义3个枚举类型的变量
enum weekday{sun,mon,tue,wed,thu,fri,sat}a,b,c; //定义枚举类型的同时，定义3个变量
enum{sun,mon,tue,wed,thu,fri,sat}a,b,c;   //枚举名可省略，但后面不能再定义新的枚举变量

typedef enum weekday  //此处的weekday为枚举名
{
  Mon = 0,
  Tues,
  Wed,
  Thurs,
  Fri,
  Sat,
  Sun
}weekday;     //此处的weekday为enum weekday的别名

weekday today, tomorrow;  //枚举类型的变量，即enum weekday类型

typedef enum  //省略枚举名
{
  Mon = 0,
  Tues,
  Wed,
  Thurs,
  Fri,
  Sat,
  Sun
}weekday;     //此处的weekday为枚举类型的别名

weekday today, tomorrow;  //枚举类型的变量，即enum weekday类型

typedef enum weekday  
{
  Mon = 0,
  Tues,
  Wed,
  Thurs,
  Fri,
  Sat,
  Sun
};  

weekday today, tomorrow;  //Code::Blocks环境报错

typedef enum
{
  wednesday,
  thursday,
  friday
} workday;      //定义了一个枚举类型，别名为workday

typedef enum WEEK
{
  saturday,
  sunday = 0,
  monday,
} workday;      //定义了一个枚举类型，别名为workday，重复了

typedef enum
{
  wednesday,    //成员重复
  thursday,       
  friday
} workday_1;

typedef enum WEEK
{
  wednesday,
  sunday = 0,
  monday,
} workday_2;

typedef enum {RESET = 0, SET = !RESET} FlagStatus, ITStatus;
typedef enum {DISABLE = 0, ENABLE = !DISABLE} FunctionalState;
typedef enum {ERROR = 0, SUCCESS = !ERROR} ErrorStatus;
#define IS_FUNCTIONAL_STATE(STATE) (((STATE) == DISABLE) || ((STATE) == ENABLE))

• ​​C语言详解-枚举类型​​