复制构造函数简单应用

/***********************************************
* 文件名：例七
* 功能：复制构造函数
* 说明：用一个已知的对象初始化另一个对象
        该函数只有一个参数
* 时间：2011-3-29 --Lzy
/***********************************************/
#include <iostream.h>

class Complex
{

public:
    Complex(double x, double y);
    Complex(Complex & c);        //复制初始化构造函数

    double GetRel(){return rel;}
    double GetImg(){return img;}

private:
    double rel, img;
};

Complex::Complex(double x, double y)
{
    rel = x; img = y;
    cout<<"构造函数被调用"<<endl;
}

Complex::Complex(Complex & c)
{
    rel = c.rel;
    img = c.img;
    cout<<"复制初始化构造函数被调用"<<endl;
}

void main()
{
    Complex c1(6.8, 7.23);
    Complex c2(c1);
    cout<<"("<<c2.GetRel()<<" ,"<<c2.GetImg()<<")"<<endl;
}


//复制初始化构造函数其他应用

#include <iostream.h>

class Complex
{

public:
    Complex();
    Complex(double x, double y);
    Complex(Complex & c);        //复制初始化构造函数

    double GetRel(){return rel;}
    double GetImg(){return img;}

private:
    double rel, img;
};

Complex::Complex()
{
    rel = 0; img = 0;
    cout<<"缺省构造函数被调用"<<endl;
}

Complex::Complex(double x, double y)
{
    rel = x; img = y;
    cout<<"构造函数被调用"<<endl;
}

Complex::Complex(Complex & c)
{
    rel = c.rel;
    img = c.img;
    cout<<"复制初始化构造函数被调用"<<endl;
}

Complex fun(Complex c)
{
    cout<<"在函数fun中"<<endl;
    double x,y;
    x = c.GetRel() * 10;
    y = c.GetImg() + 100;
    Complex temp(x, y);
    return temp;
}

void main()
{
    Complex c1(6.8, 7.23), c2;
    c2 = fun(c1);
    cout<<"("<<c2.GetRel()<<" ,"<<c2.GetImg()<<")"<<endl;
}