例4.3.cpp

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