复数及友元运算.txt

铁道出版社出版的C++的习题源代码

#include<iostream.h>
class Complex
{
public:
   Complex(){real=0;imag=0;}
   Complex(double r,double i){real=r;imag=i;}
   friend Complex operator+(Complex &c1,Complex &c2);
   void display();
private:
      double real;
      double imag;
};
Complex operator+(Complex &c1,Complex &c2)
{
 return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
void Complex::display()
{
  cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
void main()
{
   Complex c1(3,4),c2(5,-10),c3;
   cout<<"c1=";c1.display();
   cout<<"c2=";c2.display();
   cout<<"c1+c2=";c2.display();
}