派生类中的构造函数与析构函数

最新推荐文章于 2021-12-13 00:28:01 发布

原创最新推荐文章于 2021-12-13 00:28:01 发布 · 1k 阅读

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本文通过一个C++示例程序深入探讨了构造函数与析构函数的工作原理。包括默认构造函数、带参数构造函数及析构函数的调用时机，展示了如何初始化类成员变量并释放资源。

#include <iostream>
using namespace std;
class Part  //部件类
{
    public:
	Part();
	Part(int i);
	~Part();
 private:
	int val;
};
class Whole: public Part
{
    public:
	Whole();
	Whole(int,int,int,int);
	~Whole();
 private:
	Part one;
	Part two;
	int data;
};
Part::Part()
{
    val=0;
	cout<<"The default constructor of part was called "<<val<<endl;
}
Part::Part(int i)
{
    val=i;
	cout<<"The constructor of part was called "<<val<<endl;
}
Part::~Part()
{
	cout<<"The destructor 33  of part was called "<<val<<endl;
}
Whole::Whole()
{
    data=0;
	cout<<"The default constructor of whole was called "<<data<<endl;
}
Whole::Whole(int p, int i,int j,int k):Part(p), two(i),one(j),data(k)
{
    cout<<"The constructor of whole was called "<<data<<endl;
}
Whole::~Whole()
{
	cout<<"The destructor 33 of whole was called "<<data<<endl;
}

int main()
{
    Whole w1;
	Whole w2(1,2,3,4);
	return 0;
}

运行结果：