复数的加减运算

/*复数的加减运算
 算法：运算符的重载函数
 
 by adengou 2011.8.12
 windows 7 dev c++5.0 和vs 2010编译通过、
*/
#include <iostream>
using namespace std;

class Complex
{
private:
 double real,imag;//实部和虚部变量
public:
  Complex(idouble a=0,double b=0)
 {real=a;imag=b;}
     Complex operator+( Complex b)//运算符+号重载
 {
   Complex c;
  c.real=real+b.real;
  c.imag=imag+b.imag;//实部相加，虚部相加
  return  Complex(c.real,c.imag);
 }
      Complex operator-( Complex b)//运算符-号重载
 {
   Complex c;
  c.real=real-b.real;
  c.imag=imag-b.imag;//实部相减，虚部相减
  return  Complex(c.real,c.imag);
 }
 void add()
 {
  cout<<"sum("<<real<<","<<imag<<")"<<endl;
 }

};
int main()
{
Complex A(2,3), B(4,5) ,C(6 ,7),O,P,Q;//定义6个复数
O=A+B+C;//三个复数相加
cout<<"复数A+B+C=";O.add();
P=B+C;
cout<<"复数B+C=";P.add();
Q=P-O;//两复数相减
cout<<"复数P-O=";Q.add();

system("pause");
return 0;
}