Here is a simple math calculator that can perform basic arithmetic operations like addition, subtraction, multiplication, and division using CSS, HTML, and PHP.
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Sample Program Output
Program Listing
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Calculator in PHP</title>
<style type="text/css">
<!--
.btn {color: #0000CC; border: #FF0000 1px solid; width:150px; height:35px; font-family:Verdana, Arial, Helvetica, sans-serif;
font-size:20px;}
.button {background-color: #999999; border:#999900 1px solid; width:100px; height:30px; color:#FFF; font-style:bold;}
.h1 {font-family:Verdana, Arial, Helvetica, sans-serif ; font-size:24px; color:#FFFFFF;}
.label {font-family:Verdana, Arial, Helvetica, sans-serif; font-size:20px;}
.style3 {color: #FF0000; font-weight: bold; font-size:25px; }
.style4 {color: #FF0000; font-style: italic ; font-size:12px ; padding-left:20px;}
.tr {background-color: #999999;}
.tr1 {background-color: #CC9900; border: #CCCCCC 1px solid; height:30px;}
.style12 {background-color: #999999; color: #CCFF00; }
.style14 {font-size: 24px; color: #CCFF00; }
-->
body {
font-family:arial;
}
</style>
<script type="text/JavaScript">
<!--
function MM_callJS(jsStr) { //v2.0
return eval(jsStr)
}
//-->
</script>
</head>
<body >
<p> </p>
<form action="" method="post" name="form1" id="form1" >
<?php
error_reporting(0);
//start of the code of PHP Main
if (isset($_POST['Submit'])) // set the submit button when click
{
$value1=$_POST['value1']; // setting variables of the field 1 and field 2
$value2=$_POST['value2'];
$operation=$_POST['operatorbutton']; //setting up variables with radio button
$Fresult='';
if ($value1=='' ) { //check the field if it is empty and post it with javascript msgbox
echo '<script language="javascript" >' ;
echo 'alert("Field 1 is required");';
echo' </script>';
}
if ($value2=='') { //check the field if it is empty and post it with javascript msgbox
echo '<script language="javascript" >' ;
echo 'alert("Field 2 is required");';
echo' </script>';
}
//start of the operation
if ($operation=='') {
echo '<script language="javascript" >' ;
echo 'alert("Division of zero is not allowed");';
echo' </script>';} //checking of operator if it is null
elseif($operation == 'add') {
//addition
$Fresult=$value1+$value2;}
elseif ($operation == 'sub') {
//subtraction
$Fresult=$value1-$value2;}
elseif ($operation == 'mul') {
//multiplication
$Fresult=$value1*$value2;}
elseif ($operation == 'div')
//division
{
// checking if if is divided in zero and post it in a javascript
if ($value2 =='0')
{
echo '<script language="javascript" >' ;
echo 'alert("Division of zero is not allowed");';
echo' </script>';
}
else //else perform division
{$Fresult=$value1/$value2;}
}
//setting all radio button to unchecked
$add = 'unchecked';
$subtract = 'unchecked';
$multiply = 'unchecked';
$divide = 'unchecked';
//setting variable for selected operator button
$selected_button = $_POST['operatorbutton'];
if ($selected_button == 'add')
{
$add = 'checked';
}
else if ($selected_button == 'sub')
{
$subtract = 'checked';
}
else if ($selected_button == 'mul')
{
$multiply = 'checked';
}
else if ($selected_button == 'div')
{
$divide = 'checked';
}
} //end of main
?>
<table width="764" border="0" align="center" cellpadding="4" style="border:#CC9900 1px solid;">
<tr>
<th colspan="3" bgcolor="#CC6600" scope="col" class="tr1"><h1 class="h1">Calculator in PHP</h1></th>
</tr >
<tr>
<td width="26%"><div align="right" class="label">First Number </div></td>
<td width="1%"><span class="style3">:</span></td>
<td width="73%" ><input name="value1" type="text" class="btn" id="value1" value="<?php echo trim($_POST['value1']); ?>" onkeypress=" return isNumberKey(event)" /></td>
<!--display the error-->
</tr>
<tr>
<td height="30"><div align="right" class="label">Second Number </div></td>
<td><span class="style3">:</span></td>
<td><input name="value2" type="text" class="btn" id="value2" value="<?php echo trim( $_POST['value2']); ?>" onkeypress=" return isNumberKey(event)"/></td>
</tr>
<tr class="tr">
<td height="24"><div align="right" class="label">Math Operator</div></td>
<td class="style3">:</td>
<td >
<span class="style12">
<input name="operatorbutton" type="radio" checked="checked" <?PHP print $add; ?>; value="add" />
Addition
<input name="operatorbutton" type="radio" value="sub" <?PHP print $subtract; ?> />
Subtraction
<input name="operatorbutton" type="radio" value="mul" <?PHP print $multiply; ?>/>
Multiplication
<input name="operatorbutton" type="radio" value="div" <?PHP print $divide; ?> />
Division</span><span class="style14"> </span></td>
</tr>
<tr>
<td height="26"><div align="right" class="label">Result</div></td>
<td class="style3">:</td>
<td class="style3"><?php echo $Fresult; ?></td>
</tr>
<tr>
<td class="style4"><div align="center"></div>
<div align="center"></div></td>
<td> </td>
<td><input name="Submit" type="submit" class="button" value="Calculate"/>
<input name="cmdReset" type="submit" class="button" id="cmdReset" onclick="MM_callJS('cleartext()')" value="Clear" />
<label></label></td>
</tr>
<tr>
<td colspan="3"><div align="center" class="tr1"></div></td>
</tr>
</table>
</form>
</body>
</html>
<!-- JAVASCRIPT FOR NOT ALLOWING THE USER TO ENTER A CHARACTER TEXT-->
<script language="javascript" >
function isNumberKey(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 45 || charCode > 57))
return false;
return true;
} </script>
<script language="javascript" >
function cleartext()
{
var form = document.forms[0];
//purpose?: to make the form textfield in to null
form.value1.value = "";
form.value2.value = "";
} </script>
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