typedef

http://www.cnblogs.com/JCSU/articles/1299051.html

typedef enum

意义:用typedef关键字将枚举类型定义成别名,并利用该别名进行变量声明:

typedef enum workday
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
} workday; //此处的workday为枚举型enum workday的别名
workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday,也即enum workday

enum workday中的workday可以省略:

typedef enum
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
} workday; //此处的workday为枚举型enum workday的别名

workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday,也即enum workday

也可以用这种方式:

typedef enum workday
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
};

workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday,也即enum workday

typedef struct

http://www.cnblogs.com/qyaizs/articles/2039101.html

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