Basic Programming Examples: Simple PHP Calculator

<html>
<head><title>PHP calculator</title></head>
<body>
    <?php
        $var1 =$_POST['num1'];
        $var2 =$_POST['num2'];
        $equal = "";
        $submitAdd =$_POST['submitAdd'];
        $submitSub =$_POST['submitSub'];
        $submitMul =$_POST['submitMul'];
        $submitDiv =$_POST['submitDiv'];
        if($submitAdd!=""){
            $equal =$var1+$var2;
            $operation = "+";
        }
        else if($submitSub!=""){
            $equal =$var1-$var2;
            $operation = "-";
        }
        else if($submitMul!=""){
            $equal =$var1*$var2;
            $operation = "*";
        }
        else if($submitDiv!=""){
            $equal =$var1/$var2;
            $operation = "/";
        }
    ?>
    <form name="form1" action="" method="post">
        <p>CALCULATOR</p>
        <p>
            <input type="text" name="num1" size="1" value="<?php if($var1){ echo $var1;}?>"/>
            <input type="text" name="num2" size="1" value="<?php if($var2){ echo $var2;}?>"/>
            <input type="submit" name="submitAdd" id="button" value="add"/>
            <input type="submit" name="submitSub" id="button" value="sub"/>
            <input type="submit" name="submitMul" id="button" value="mul"/>
            <input type="submit" name="submitDiv" id="button" value="div"/>
        </p>
    </form>
    <?php
        if($equal != "") echo "$var1 $operation $var2 = $equal";
    ?>
</body>
</html> 
Basic Programming Examples

Tuesday, July 2, 2013

Simple PHP Calculator

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