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

//定義結構體類型
typedef struct person
{
    char name[10];//12
    char *a_name;//4
} p;

//創建結構體實例
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;
}

//釋放內存
void freeZoom(p* a)
{
    //釋放內部指針
    if (a->a_name != NULL)
    {
        free(a->a_name);
        a->a_name = NULL;
    }

    if (a != NULL)
    {
        
 
free(a);
        a = NULL;//這句是廢話
    }
}

void main()
{
    //結構體內部有指針的話，要重新操作內部指針的內容，不然復制的指針會內存共享，多次釋放會發生錯誤。
    //cout << sizeof(p) << endl;//16
    p* p1 = setPersons();
    p* p2 = (p*)malloc(sizeof(p));//分配內存
    //memcpy(p2, p1, sizeof(p1));//淺復制
    *p2 = *p1;//賦值操作淺復制
    cout << "a_name:
 
" << endl;
    char *nmm = (char *)malloc(10);//分配內存深復制
    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;

    //釋放內存
    freeZoom(p1);
    p1 = NULL;
    freeZoom(p2);
    p2 = NULL;
    
    system("pause");
}

c++淺復制和深復制