负数计算-C++

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/*
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功能：负数计算类 V1.0
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作者：wind
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日期：2013-10-11
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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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class Complex
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{
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public:
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  Complex(double aX,double aY);
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  ~Complex();
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  void setX(double aX);
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  void setY(double aY);
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  void Count(Complex other);
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private:
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  double m_aX;
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  double m_aY;
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};
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Complex :: Complex(double aX =0,double aY=0):
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m_aX(aX),m_aY(aY){};
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Complex ::~Complex()
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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_aX = aX;
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}
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void Complex::setY(double aY)
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{
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  m_aY = aY;
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}
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void Complex::Count(Complex other)
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{
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  string choice;
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  cout<<"Please input sign(+/-):";
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  cin >> choice;
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  double addresultX = m_aX + other.m_aX;
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  double addresultY = m_aY + other.m_aY;
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  double subtractresultX = m_aX - other.m_aX;
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  double subtractresultY = m_aY - other.m_aY;
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  cout <<"The result is:";
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  if (choice =="+")
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  {
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         cout <<"("<<addresultX<<","<<addresultY<<")"<<endl;
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  }
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  else if(choice == "-")
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  {
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         cout <<"("<<subtractresultX<<","<<subtractresultY<<")"<<endl;
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  }
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}
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int main(void)
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{
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  Complex P1,P2;
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  double p1x,p1y,p2x,p2y;
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  cout<<"Please input first complex number(实部,虚部):";
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  cin>>p1x>>p1y;
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  P1.setX(p1x);
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  P1.setY(p1y);
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  cout<<"Please input second complex number(实部,虚部):";
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  cin>>p2x>>p2y;
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  P2.setX(p2x);
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  P2.setY(p2y);
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  P1.Count(P2);
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  system("pause");
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  return 0;
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}