operator重载之三维坐标计算—C++

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/*
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功能：三维坐标计算
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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 Point
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{
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public:
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  Point()
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  {
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    m_iX = 0;
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    m_iY = 0;
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    m_iZ = 0;
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  }
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  void set(double aX,double aY,double aZ);
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  void get()const;
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  Point operator + (Point c1);
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  Point operator - (Point c1);
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  void display(Point c1);
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private:
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  double m_iX;
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  double m_iY;
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  double m_iZ;
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};
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/************************************************************/
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void Point::set(double aX,double aY,double aZ)
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{
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  m_iX = aX;
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  m_iY = aY;
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  m_iZ = aZ;
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}
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void Point::get()const
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{
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  cout<<"The result is:"<<endl;
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  cout<<"("<<m_iX<<","<<m_iY<<","<<m_iZ<<")"<<endl;
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}
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Point Point::operator + (Point c1)
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{
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  Point 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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  c.m_iZ = m_iZ + c1.m_iZ;
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  return c;
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}
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Point Point::operator - (Point c1)
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{
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  Point 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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  c.m_iZ = m_iZ - c1.m_iZ;
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  return c;
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}
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void Point::display(Point c1)
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{
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  string n;
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  Point 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:"<<endl;
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      cout<<"("<<c.m_iX<<","<<c.m_iY<<","<<c.m_iZ<<")"<<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:"<<endl;
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    cout<<"("<<c.m_iX<<","<<c.m_iY<<","<<c.m_iZ<<")"<<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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  Point c1,c2;
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  double x = 0;
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  double y = 0;
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  double z = 0;
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    cout<<"请输入第一个点所在的三维坐标：";
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  cin>>x>>y>>z;
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  c1.set(x,y,z);
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  cout<<"请输入第二个点所在的三维坐标：";
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  cin>>x>>y>>z;
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  c2.set(x,y,z);
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  c1.display(c2);
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  system("pause");
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  return 0;
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}