#include <iostream>
#include <iomanip>
using namespace std;     

class Cartesian
{
      private:
              double x;
              double y;
      public:
             Cartesian(double = 0, double = 0);
             void setXY( double , double);
             double showX(){return x;};
             double showY(){return y;};
             void operator=(Cartesian &);
};

Cartesian::Cartesian( double in_x, double in_y)
{
                      x = in_x;
                      y = in_y;
}
void operator=(Cartesian& newXY)
{
     x = newXY.x;
     y = newXY.y;
}


int main()
{
    double x,y;
    cout << "\nPlease input a X coordinate: ";
    cin >> x;
    cout << "\nPlease input a Y coordinate: ";
    cin >> y;
    
    Cartesian xy1(x, y), xy2;
    cout << "The first coordinate pair is - " << xy1.showX() << "," << xy1.showY() << endl;
    xy2 = xy1;
    cout << "The second coordinate pair is - " << xy2.showX() << "," << xy2.showY() << endl;
               
    system("PAUSE");
    return 0;

}

must be a nonstatic member function
`void operator=(Cartesian&)' must take exactly two arguments
In function `void operator=(Cartesian&)':
`x' undeclared (first use this function)
(Each undeclared identifier is reported only once for each function it appears in.)
`double Cartesian::x' is private
within this context
`y' undeclared (first use this function)
`double Cartesian::y' is private
within this context

double showX() const {return x;};
double showY() const {return y;};