typedef类型定义

作用：

1. 避免数据类型过长难以记忆和书写，如 “cosnt unsigned long long”、“struct student”，通过类似取别名的方式来简化数据类型的名称

2. 通过给一个数据类型取一个特定的别名，使得其为特定的数据服务，方便记忆和理解

注意：typedef类型定义一般写在最外面

代码如下：

//1.
typedef struct {
    char* name;
    int age;
    int score;
} Student;
//2.
typedef enum {
    DirectionEast,//默认值为0
    DirectionWest,//默认值为1
    DirectionSouth,//默认值为2
    DirectionNorth//默认值为3
} Direction;
//3.
typedef const unsigned long long cull;
int main() {
    Student stu = { "ZhangSan",1,100};
    Direction dir0 = DirectionEast;
    Direction dir1 = DirectionWest;
    Direction dir2 = DirectionSouth;
    Direction dir3 = DirectionNorth;
    cull number = 3;
    printf("stu.name:%s\n", stu.name);
    printf("stu.age:%d\n", stu.age);
    printf("stu.score:%d\n", stu.score);

    printf("\nDirectionEast:%d\n", dir0);
    printf("DirectionWest:%d\n", dir1);
    printf("DirectionSouth:%d\n", dir2);
    printf("DirectionNorth:%d\n", dir3);

    printf("\nnumber:%lld\n",number);
}

运行结果如下：

typedef类型定义

原文：https://www.cnblogs.com/young12123/p/14272562.html