黑马程序员_C语言typedef

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typedef是C语言的关键字，其作用是为数据类型定义别名。

typedef int Integer;typedef unsigned int UInterger;typedef float Float;int main() {        //用别名定义变量    Integer i = 2;    UInterger ui = 17;    Float f = 13.14f;      return 0;}

1 typedef与指针
typedef不仅能为基本数据结构类型定义别名，还能为指针定义别名。除了基本类型指针，结构体指针以及指向函数的指针也能被定义别名。

typedef char *String;// 定义一个结构体struct Student {    int age;    float height;};// 起别名typedef struct Student *pStudent;// 定义一个sum函数int sum(int a, int b) {    return c = a + b;}//定义一个指向函数的指针的别名typedef int (*pSum)(int, int);int main(int argc, const char * argv[]) {    // 相当于char *str = "zhangsan";    String str = "zhangsan";        struct Student stu = {12,123.4f};    pStudent pStu = &stu;  //结构体指针    pSum p = sum; //指向函数的指针    int a = (*p)(1,2);             return 0;}

2 typedef与结构体，枚举

enum Season {spring, summer, autumn, winter};// 给枚举类型起别名typedef enum Season Season;/*简化写法typedef enum Season {spring, summer, autumn, winter} Season;typedef enum {spring, summer, autumn, winter} Season;*/// 定义一个结构体struct Student {    int age;    float height;};// 起别名typedef struct Student Student;/*简化写法typedef struct Student {    int age;    float height;} Student;typedef struct {    int age;    float height;} Student;*/int main(int argc, const char * argv[]) {        Season s = summer;        Student stu;    stu.age = 12;        return 0;}

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