typedef 和 typedef struct 的使用

typedef.c

#include <stdio.h>

// 给 int 类型起个别名为 INT
typedef int INT;

// 方式 2
// 定义 Student 结构体类型
struct Student {
    char name;
    int age;
};

// 方式 3
// 定义 HeadTeacher 结构体类型，并声明一个 h1 变量
struct HeadTeacher {
    int age;
} h1;

// 方式 4
// 定义一个 结构体类型，并设置别名为 Teacher
typedef struct {
    int age;
} Teacher;

// 定义一个 Node 结构体类型，并设置别名为 Node
typedef struct Node {
    int val;
    struct Node *next;
} Node;

int main(int argc, const char * argv[]) {
    
    // 方式 1
    struct {
        int age;
    } student;
    
    student.age = 18;
    printf("student age = %d \n", student.age);
    
    struct Student student1;
    student1.age = 20;
    printf("student1 age = %d \n", student1.age);
    
    h1.age = 50;
    struct HeadTeacher h2;
    h2.age = 70;
    printf("head teacher1 age = %d \n", h1.age);
    printf("head teacher2 age = %d \n", h2.age);
    
    Teacher t;
    t.age = 30;
    printf("teacher age = %d \n", t.age);
    
    Node n1;
    n1.val = 10;
    Node n2;
    n2.val = 100;
    n1.next = &n2;
    
    printf("%d \n", n1.val);
    printf("%d \n", n1.next->val);
    
    return 0;
}