calculator

<?php

class Calculator {

  public $number1;
  public $number2;
  public $op_type; // operation type . + . - . * . /

  function set_value($n1,$n2)
  {
    $this -> number1 = $n1;
    $this -> number2 = $n2;
  }

  function setop($op) // set operation
  {
    $this -> op_type = $op;
  }

  function Calculate()
  {
    switch ($this -> op_type)
    {
      case '+';
      echo $this -> number1 + $this -> number2;
      break;

      case '-';
      echo $this -> number1 - $this -> number2;
      break;

      case '*';
      echo $this -> number1 * $this -> number2;
      break;

      case '/';
      if ($this -> number2 == 0)
      echo " Div by zer0";
      else
      echo $this -> number1 / $this -> number2;
      break;


    }
  }
}

$v = new Calculator();
$v->set_value(10,5);
$v->setop('/');
$v->Calculate();

?>