HR30 Day 13: Abstract Classes/PHP

개요

• HR30 Day 13: Abstract Classes

<?php
abstract class Book
{
    protected $title;
    protected  $author;
    
    function __construct($t,$a){
        $this->title=$t;
        $this->author=$a;
    }
    abstract protected function display();
}

class MyBook extends Book
{
    protected $price;
    function __construct($title, $author, $price) {
        parent::__construct(trim($title), trim($author));
        $this->price = $price;
    }
    function display() {
        echo 'Title: ' . $this->title . "\n";
        echo 'Author: ' . $this->author . "\n";
        echo 'Price: ' . $this->price . "\n";
    }
}

$title=fgets(STDIN);
$author=fgets(STDIN);
$price=intval(fgets(STDIN));
$novel=new MyBook($title,$author,$price);
$novel->display();
?>