operator重载之复数计算—C++

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/*
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功能：复数计算类
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作者：wind
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日期：2013-11-29
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*/
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#include <iostream>
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#include <string>
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using namespace std;
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/************************************************************/
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class Complex
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{
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public:
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  Complex()
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  {
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    m_iX = 0;
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    m_iY = 0;
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  }
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  Complex(double aX,double aY);
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  void setX(double aX);
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  double getX()const;
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  void setY(double aY);
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  double getY()const;
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  Complex operator + (Complex c1);
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  Complex operator - (Complex c1);
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    void display(Complex c1);
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private:
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  double m_iX;
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  double m_iY;
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};
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/************************************************************/
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void Complex::setX(double aX)
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{
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  m_iX = aX;
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}
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double Complex::getX()const
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{
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  return m_iX;
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}
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void Complex::setY(double aY)
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{
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  m_iY = aY;
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}
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double Complex::getY()const
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{
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  return m_iY;
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}
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Complex::Complex(double aX,double aY)
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{
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  m_iX =  aX;
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  m_iY =  aY;
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}
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Complex Complex::operator + (Complex c1)
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{
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  Complex c;
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  c.m_iX = m_iX + c1.m_iX;
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  c.m_iY = m_iY + c1.m_iY;
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  return c;
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}
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Complex Complex::operator - (Complex c1)
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{
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  Complex c;
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  c.m_iX = m_iX - c1.m_iX;
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  c.m_iY = m_iY - c1.m_iY;
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  return c;
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}
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void Complex::display(Complex c1)
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{
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     string n;
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   Complex c;
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   cout<<"Please input the sign(-/+):";
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   cin>>n;
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   if  ("-" == n)
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   {
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     c = operator- (c1);
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     cout<<"The result is"<<"("<<c.m_iX<<","<<c.m_iY<<")"<<endl;
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   }
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   else if ("+" == n)
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   {
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     c = operator+ (c1);
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     cout<<"The result is"<<"("<<c.m_iX<<","<<c.m_iY<<")"<<endl;
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   }
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   else
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   {
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         cout<<"The operator is error";
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   }
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}
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/************************************************************/
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int main(void)
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{
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  Complex c1,c2;
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  double aX,aY;
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  cout<<"请输入第一个复数:(实部，虚部)：";
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  cin>>aX>>aY;
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  c1.setX(aX);
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  c1.setY(aY);
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  cout<<"请输入第二个复数:(实部，虚部)：";
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  cin>>aX>>aY;
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  c2.setX(aX);
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  c2.setY(aY);
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  c1.display(c2);
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  system("pause");
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  return 0;
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}