demo_operator_02_d.cpp

对于一个初涉VC＋＋的人来书

//************************************************
// 定义一个复数类,重载运算符"+"实现复数加法运算
// 参加运算的两个运算量可以都是类对象或其中之一为
// 整数,顺序任意. 
//************************************************

#include <iostream.h>

class Complex
{
public:
	Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    Complex operator+(Complex &c2);
    Complex operator+(int &i);
    friend Complex operator+(int&,Complex &);
    void display();
private:
    double real;
    double imag;
};
 
Complex Complex::operator+(Complex &c)
{
	return Complex(real+c.real,imag+c.imag);
}
 
Complex Complex::operator+(int &i)
{
	return Complex(real+i,imag);
}

void Complex::display()
{
	cout<<"("<<real<<","<<imag<<"i)"<<endl;
}

Complex operator+(int &i,Complex &c)
{
	return Complex(i+c.real,c.imag);
}

int main()
{
	Complex c1(3,4),c2(5,-10),c3;
	int i=5;

	c3=c1+c2;
	cout<<"c1+c2=";
	c3.display();

	c3=i+c1;
	cout<<"i+c1=";
	c3.display();

	c3=c1+i;
	cout<<"c1+i=";
	c3.display();

	return 0;
}