struct和typedef

typedef struct _People   //_People为结构名{    int age;}People;                //People为结构别名 = struct _People//ortypedef struct{    int age;}People;

People代表一个结构，使用是为：

People onePeople;

onePeople.age;

struct _People        //_People为结构名{    int age;}people;             //people为结构变量

people是一个变量，使用时为：

people.age;

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