TaskInterface.php

<?php

interface TaskInterface
{
  /**
   * Assign the first number
   * @param int $value
   * @return $this
   */
  public function setA($value);
  
  /**
   * Assign the other number
   * @param int $value
   * @return $this
   */
  public function setB($value);
  
  /**
   * Calculate greatest common divisor, return false if none found
   * @return int|false
   */
  public function findGCD();
  
  /**
   * Calculate least common multiple, return false if none found
   * @return int|false
   */
  public function findLCM();
}