结构体中套结构体如何申请动态内存

结构体中套结构体申请动态内存的方法如下：

#include <stdio.h>
#include <stdlib.h>

// 定义内部结构体
typedef struct {
    int year;
    int month;
    int day;
} Date;

// 定义外部结构体
typedef struct {
    char name[20];
    int age;
    Date *birthday; // 指向内部结构体的指针
} Person;

int main() {
    // 动态分配内部结构体
    Date *birthday = (Date *)malloc(sizeof(Date));
    birthday->year = 2000;
    birthday->month = 1;
    birthday->day = 1;

    // 动态分配外部结构体
    Person *person = (Person *)malloc(sizeof(Person));
    strcpy(person->name, "Tom");
    person->age = 20;
    person->birthday = birthday;

    // 输出结果
    printf("Name: %s\n", person->name);
    printf("Age: %d\n", person->age);
    printf("Birthday: %d-%d-%d\n", person->birthday->year, person->birthday->month, person->birthday->day);

    // 释放内存
    free(birthday);
    free(person);

    return 0;
}