Subtracting Two Numbers

There are three methods to subtract two numbers:

Subtraction in Simple Code

Subtraction of two numbers 30 and 15 is shown.

Example:


<?php  
$x=30;  
$y=15;  
$z=$x-$y;  
echo "Difference: ",$z;  
?>

Output

Subtraction in Form

By inserting values in the form two numbers can be subtracted.

Example: 


<html>  
<body>  
<form method="post">  
    Enter First Number:  
    <input type="number" name="number1" /><br><br>  
    Enter Second Number:  
    <input type="number" name="number2" /><br><br>  
    <input type="submit" name="submit" value="Subtract">  
</form>  
<?php  
    if(isset($_POST['submit']))  
    {  
        $number1 = $_POST['number1'];  
        $number2 = $_POST['number2'];  
        $sum =  $number1 - $number2;   
        echo "The difference of $number1 and $number2 is: " . $sum;  
    }  
?>  
</body>  
</html>

Output

Subtraction in Form without (-) Operator

By inserting values in the form two numbers can be subtracted but without using (-) operator.

Example:


<body>  
<form>       
    Enter First Number:  
    <input type="number" name="number1" /><br><br>  
    Enter Second Number:  
    <input type="number" name="number2" /><br><br>  
    <input type="submit" name="submit" value="Subtract">  
</form>  
</body>  
<?php  
    @$number1 = $_GET['number1'];   
    @$number2 = $_GET['number2'];  
    for ($i = 1; $i <= $number2; $i++)     
    {      
        $number1--;      
    }      
    echo "Difference=" . $number1;  
?>

Output