Ejemplos de Rectangle::print_area en PHP

Ejemplo n.º 1

Archivo: class-4.php Proyecto: RavindraGkm/batchex

<?php

abstract class Shape
{
    protected $w;
    protected $h;
    protected $area;
    function __construct($w, $h)
    {
        $this->w = $w;
        $this->h = $h;
    }
    abstract function cal_area();
    function print_area()
    {
        echo $this->area;
    }
}
class Rectangle extends Shape
{
    function cal_area()
    {
        $this->area = $this->w * $this->h;
    }
}
$obj = new Rectangle(200, 300);
$obj->cal_area();
$obj->print_area();