<?php require_once '/vendor/autoload.php'; $multi = new Calculator(); $multi->setOperation(new Multiplication()); $multi->setOperands(3, 5); $multi->calculate(); var_dump($multi->getResult()); $add = new Calculator(); $add->setOperation(new Addition()); $add->setOperands(12, 14); $add->calculate(); var_dump($add->getResult()); $subtract = new Calculator(); $subtract->setOperation(new Subtraction()); $subtract->setOperands(15, 6); $subtract->calculate(); var_dump($subtract->getResult());