Overloading operators

// overloading operators example
#include <iostream>
using namespace std;

class CVector {
  public:
    int x,y;
    CVector () {};
    CVector (int a,int b) : x(a), y(b) {}
    CVector operator + (const CVector&);

    CVector operator - (const CVector&);
};

CVector CVector::operator+ (const CVector& param) {           //operator+
  CVector temp;
  temp.x = x + param.x;
  temp.y = y + param.y;
  return temp;
}
CVector CVector::operator- (const CVector& param) {           //operator-
  CVector temp;
  temp.x = x - param.x;
  temp.y = y - param.y;
  return temp;
}
int main () {
  CVector foo (3,1);
  CVector bar (1,2);
  CVector result;
  result = foo + bar;
  cout << result.x << ',' << result.y << '\n';
  return 0;
}