C++_构造与析构的使用

介绍

本文使用构造与析构输出字符串"ABCC"

源码

#include<iostream>
#include<string>

using namespace std;

class Test
{
	char x;
public:
	Test(char t) : x(t)
	{

		cout << 'A';
	}
	~Test()
	{
		cout << this->x << "CC" << endl;
	}
};

int main()
{
	//栈区对象
	{
		cout << "栈区对象：" << endl;
		Test p1('B');
	}
	cout << endl;
	//堆区对象
	cout << "堆区对象：" << endl;
	Test *p2 = new Test('B');
	delete p2;

	system("pause");
	return 0;
}

运行结果

栈区对象：
ABCC

堆区对象：
ABCC
请按任意键继续. . .

笔记扩充

构造析构 的 构造顺序

源码

#include<iostream>
#include<string>

using namespace std;

class A
{
public:
	A(){ cout << "A构造" << endl; }
	~A(){ cout << "A析构" << endl; }

};
class B
{
	A a;
public:
	B(){ cout << "B构造" << endl; }
	~B(){ cout << "B析构" << endl; }
};
class C
{
	B b;
public:
	C(){ cout << "C构造" << endl; }
	~C(){ cout << "C析构" << endl; }
};
void main()
{
	C *pc=new C;
	cout << endl;
	delete pc;

	system("pause");
}

运行结果

A构造
B构造
C构造

C析构
B析构
A析构
请按任意键继续. . .