| program-organization/kn-clarification/point.cpp - The header file point.cpp. | Lecture 2 - slide 44 : 46 Program 3  | 
#include <cmath>
#include <iostream>
#include "point.h"
Point::Point(): x(0.0), y(7.0){
}
Point::Point(double x_coord): x(x_coord), y(20.0){
}
Point::Point(double x_coord, double y_coord): x(x_coord), y(y_coord){
}
Point::Point(Point& p): x(p.x + 1.0), y(p.y + 2.0){
}
Point::Point(Tripple t): x(double(t.getx())), y(double(t.gety())) {
}
double Point::getx () const{
    return x;
}
double Point::gety () const{
    return y;
}
std::ostream& operator<<(std::ostream& s, const Point& p){
    return s << "(" << p.getx() << "," << p.gety() << ")" ;
}