A simple Add, Subtract, Multiply, and Divide Calculator. This is a short example of a form, data validation, commenting, CSS, HTML, and rather neat code. Beginners may benifit from the source code contained within.
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<?
/*
Calculator - by Jason Garber
www.ionzoft.com
This is a short example of a form, data validation, commenting, and rather neat code.
Started Coding at 9:09
Finished testing and debugging at 9:35
24 Minutes
*/
//Get the double values of the inputs (convert them from string to double)
$txtNUMER = doubleval($txtNUMER);
$txtDENOM = doubleval($txtDENOM);
//If the ACTION is SOLVE
//Note: Action is an hidden input tag. It will NOT be present the first time the page is loaded
if($ACTION == "SOLVE")
{
//What operator are we using?
switch($cboOPER)
{
case 'ADD':
$sOut = "$txtNUMER + $txtDENOM = " . ($txtNUMER + $txtDENOM);
break;
case 'SUB':
$sOut = "$txtNUMER - $txtDENOM = " . ($txtNUMER - $txtDENOM);
break;
case 'MUL':
$sOut = "$txtNUMER * $txtDENOM = " . ($txtNUMER * $txtDENOM);
break;
case 'DIV':
if($txtDENOM == 0) //Check for divide by 0 condition
$sOut = "Error: Divide by Zero";
else
$sOut = "$txtNUMER / $txtDENOM = " . ($txtNUMER / $txtDENOM);
break;
default: //If we are here, then someone was probably monkeying with the query string...
$sOut = "Error: Invalid Operator";
}
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>Calculator</title>
<style type="text/css">
body
{
font-family: Tahoma;
font-size: smaller;
}
</style>
</head>
<body>
<h1>Calculator</h1>
<h3 style="color: navy;">Enter your Calculation and click Solve:</h3>
<br>
<h4 style="color: red;"><?= $sOut?></h4>
<form name="frmCalc" action="<?= $PHP_SELF?>" method="get">
<input type="Hidden" name="ACTION" value="SOLVE">
<table>
<tr>
<td></td>
<td><input type="Text" name="txtNUMER" width="12" value="<?= $txtNUMER ?>"></td>
</tr>
<tr>
<td>
<select name="cboOPER" size="1">
<option value="ADD" <?= ($cboOPER == "ADD" ? "selected" : "")?>>+</option>
<option value="SUB" <?= ($cboOPER == "SUB" ? "selected" : "")?>>-</option>
<option value="MUL" <?= ($cboOPER == "MUL" ? "selected" : "")?>>*</option>
<option value="DIV" <?= ($cboOPER == "DIV" ? "selected" : "")?>>/</option>
</select>
</td>
<td><input type="Text" name="txtDENOM" width="12" value="<?= $txtDENOM ?>"></td>
</tr>
<tr>
<td colspan="2"><hr width="100%"></td>
</tr>
<tr>
<td></td>
<td align="right"><input type="Submit" value="Solve"></td>
</tr>
</table>
</form>
</body>
</html>
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