c++浅复制和深复制

#include <iostream>
#include <string>
#include <windows.h>
using namespace std;

//定义结构体类型
typedef struct person
{
    char name[10];//12
    char *a_name;//4
} p;

//创建结构体实例
p * setPersons()
{
    p *c = (p*)malloc(sizeof(p));
    cout << "name:" << endl;
    cin >> c->name;
    cout << "a_name:" << endl;
    char *nmm = (char *)malloc(10);
    cin >> nmm;
    c->a_name = nmm;
    return c;
}

//释放内存
void freeZoom(p* a)
{
    //释放内部指针
    if (a->a_name != NULL)
    {
        free(a->a_name);
        a->a_name = NULL;
    }

    if (a != NULL)
    {
        free(a);
        a = NULL;//这句是废话
    }
}

void main()
{
    //结构体内部有指针的话，要重新操作内部指针的内容，不然复制的指针会内存共享，多次释放会发生错误。
    //cout << sizeof(p) << endl;//16
    p* p1 = setPersons();
    p* p2 = (p*)malloc(sizeof(p));//分配内存
    //memcpy(p2, p1, sizeof(p1));//浅复制
    *p2 = *p1;//赋值操作浅复制
    cout << "a_name:" << endl;
    char *nmm = (char *)malloc(10);//分配内存深复制
    cin >> nmm;
    p2->a_name = nmm;

    //打印
    cout << p1->name << endl;
    cout << p1->a_name << endl;
    cout << p2->name << endl;
    cout << p2->a_name << endl;

    //释放内存
    freeZoom(p1);
    p1 = NULL;
    freeZoom(p2);
    p2 = NULL;
    
    system("pause");
}