Basic Programming Examples: Simple PHP Calculator using an object

This gives the same result as the previous post, however this introduces the use of an object to learn the basics of OOP in PHP .

<?php
class Calculator
{
    public $num1;
    public $num2;

    public function doAddition()
    {
        return ($this->num1+$this->num2);
    }

    public function doSubtraction()
    {
        return ($this->num1-$this->num2);
    }

    public function doMultiplication()
    {
        return ($this->num1*$this->num2);
    }

    public function doDivision()
    {
        return ($this->num1/$this->num2);
    }
}
?>

<html>
<head><title>PHP calculator</title></head>
<body>
    <?php
    $calculator = new Calculator();

        $calculator->num1 =$_POST['num1'];
        $calculator->num2 =$_POST['num2'];
        $equal = "";

        $submitAdd =$_POST['submitAdd'];
        $submitSub =$_POST['submitSub'];
        $submitMul =$_POST['submitMul'];
        $submitDiv =$_POST['submitDiv'];

        if($submitAdd!=""){
            $equal = $calculator->doAddition();
            $operation = "+";
        }
        else if($submitSub!=""){
            $equal =$calculator->doSubtraction();
            $operation = "-";
        }
        else if($submitMul!=""){
            $equal =$calculator->doMultiplication();
            $operation = "*";
        }
        else if($submitDiv!=""){
            $equal =$calculator->doDivision();
            $operation = "/";
        }
    ?>
    <form name="form1" action="" method="post">
        <p>CALCULATOR</p>
        <p>
            <input type="text" name="num1" size="1" value="<?php if($calculator->num1){ echo $calculator->num1;}?>"/>
            <input type="text" name="num2" size="1" value="<?php if($calculator->num2){ echo $calculator->num2;}?>"/>
            <input type="submit" name="submitAdd" id="button" value="add"/>
            <input type="submit" name="submitSub" id="button" value="sub"/>
            <input type="submit" name="submitMul" id="button" value="mul"/>
            <input type="submit" name="submitDiv" id="button" value="div"/>
        </p>
    </form>
    <?php
        if($equal != "") echo "$calculator->num1 $operation $calculator->num2 = $equal";
    ?>
</body>
</html>

Basic Programming Examples

Wednesday, July 3, 2013

Simple PHP Calculator using an object

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