第四章第1题

#include <iostream>
 using namespace std;
  class Complex 
   {public:    
    Complex(){real=0;imag=0;}  
  Complex(double r,double i){real=r;imag=i;} 
     double get_real();  
   double get_imag();  
 void display(); 
   private:   
 double real;  
   double imag; 
};  
 double Complex::get_real()
  {return real;} 
    double Complex::get_imag()
 {return imag;}
 
 void Complex::display() 
  {cout<<"("<<real<<","<<imag<<"i)"<<endl;} 
    Complex operator + (Complex &c1,Complex &c2)
 {  
  return Complex(c1.get_real()+c2.get_real(),c1.get_imag()+c2.get_imag());
   } 
 int main()
   {Complex c1(5,6),c2(3,-7),c3;
 c3=c1+c2; 
  cout<<"c3=";
    c3.display(); 
 return 0;
  }