point_interpolation.php

<?php
class Point
{
    private int $x;
    private int $y;

    public function __construct(int $x = 0, int $y = 0)
    {
        $this->x = $x;
        $this->y = $y;
    }

    public function __toString()
    {
        return "({$this->x}, {$this->y})";
    }
}