Calculator - PHP

<?php
namespace CalculatorBundle\Entity;
class Calculator
{
    /*
     * @var float
     */
    private $leftOperand;
    /*
     * @var float
     */
    private  $rightOperand;
    /*
     * @var string
     */
    private  $operator;
    /*
     * @return float
     */
    public function getLeftOperand()
    {
        return $this->leftOperand;
    }
    /*
     * @param float $operand
     *
     * @return Calculator
     */
    public function setLeftOperand($operand)
    {
        $this->leftOperand=$operand;
        return $this;
    }
    /*
     * @return float
     */
    public function getRightOperand()
    {
        return $this->rightOperand;
    }
    /*
     * @param float $operand
     *
     * @return Calculator
     */
    public function setRightOperand($operand)
    {
        $this->rightOperand=$operand;
        return $this;
    }
    /*
     * @return string
     */
    public function getOperator()
    {
        return $this->operator;
    }
    /*
     * @param string $operator
     *
     * @return Calculator
     */
    public function setOperator($operator)
    {
        $this->operator=$operator;
        return $this;
    }
}
?>