友元重载.doc

铁道出版社出版的C++的习题源代码

#include<iostream.h>
class Complex
{
public:
	Complex(){real=0;image=0;}
	Complex(double r,double i){real=r;image=i;}
	friend Complex operator + (Complex &c1,Complex &c2);
	void display();

private:
	double real;
	double image;
};
Complex operator+(Complex &c1,Complex &c2)
{
	return Complex(c1.real+c2.real,c1.image+c2.image);
}
void Complex::display()
{
	cout<<"("<<real<<","<<image<<"i)"<<endl;
}
void main()
{
	Complex c1(3,4),c2(5,-10),c3;
	c3=c1+c2;
	cout<<"c1=";c1.display();
	cout<<"c2=";c2.display();
	cout<<"c1+c2=";c3.display();
}