#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
using namespace std;class Person
{
public:Person(){cout << "默認構造函數調用" << endl;}Person(int a){m_Age = a;cout << "有參構造函數調用" << endl;}Person(const  Person & p ){m_Age = p.m_Age;cout << "拷貝構造函數調用" << endl;}~Person(){cout << "析構函數調用" << endl;}int m_Age;
};//1、使用一個已經創建好的對象來初始化另一個對象
void test01()
{Person p1(18);Person p2(p1);cout << "p2年齡為： " << p2.m_Age << endl;
}//2、以值傳遞的方式 給函數的參數傳值
void doWork( Person p)
{
}void test02()
{Person p1;doWork(p1);
}//3、以值的方式返回局部對象
Person doWork2()
{Person p1;return p1;
}void test03()
{Person p = doWork2();
}/*編譯器將代碼進行了優化void doWork2(Person & p){}void test03(){Person p;doWork2(p);}*/int main(){//test01();//test02();test03();system("pause");return EXIT_SUCCESS;
}