析构函数简单应用

/****************************************************
* 文件名：例八
* 功能：析构函数
* 说明：析构函数可以由程序调用，也可以由系统自动调用
* 时间：2011-3-29      --Lzy
/****************************************************/
#include <iostream.h>            //观察析构函数调用顺序


class Elipse
{
private:
    double x, y, a, b;

public:
    Elipse();
    Elipse(double, double, double, double);
    ~Elipse();        //析构函数

    void printf();
};

Elipse::Elipse()
{
    cout<<"缺省构造函数"<<endl;
    x = y = a = b = 0;
}

Elipse::Elipse(double x1, double y1, double a1, double b1)
{
    cout<<"带参数构造函数"<<endl;
    x = x1; y = y1; a = a1; b = b1;
}

Elipse::~Elipse()
{
    cout<<"析构函数";
    cout<<"("<<x<<" ,"<<y<<")"<<" a="<<a<<" b="<<b<<endl;
}

void Elipse::printf()
{
    cout<<"("<<x<<" ,"<<y<<")"<<" a="<<a<<" b="<<b<<endl;
}

void main()
{
    Elipse s1, s2(100,200,300,400);
    s1.printf();
    s2.printf();

    cout<<"*********************************"<<endl;
}