Simple Calculator Using PHP

Submitted by jaredgwapo on Sunday, January 10, 2016 - 18:32.

Language

This is a simple Calculator that you can use in your project or systems. Just download the source code and follow the instructions below.

DIRECTIONS

HTML CODE

<form>
<table style="border:2px solid #000;">
            <tr>
                <td style="background-color:lightblue; color:#000; font-family:'Times New Roman'">Enter First Number</td>
                <td colspan="1">
               
                    <input name="fvalue" type="number" style="color:blue"/></td>
            <tr>
                <td style="color:#000; font-family:'Times New Roman'">Select Operator</td>
                <td>
                    <select name="operator" style="width: 63px">
<option>+</option>
<option>-</option>
<option>*</option>
<option>/</option>
</select></td>
               </tr>
            <tr>
                <td style="background-color:lightblue; color:#000; font-family:'Times New Roman'">Enter First Number</td>
                <td class="auto-style5">
                    <input name="lvalue" type="number"  style="color:blue;"/></td>
               
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" name="calculate" value="Calculate" style="color:wheat;background-color:red;" /></td>
               
            </tr>
            <tr>
                <td style="background-color:lightblue;color:#000;">Output = </td>
                <td style="color:darkblue"><?php echo $res;?></td>
               
            </tr>
       </table>
 </form>

PHP CODE

<?php
ini_set('display_errors',0);
if( isset( $_REQUEST['calculate'] ))
{
$operator=$_REQUEST['operator'];
if($operator=="+")
{
$add1 = $_REQUEST['fvalue'];
$add2 = $_REQUEST['lvalue'];
$res= $add1+$add2;
}
if($operator=="-")
{
$add1 = $_REQUEST['fvalue'];
$add2 = $_REQUEST['lvalue'];
$res= $add1-$add2;
}
if($operator=="*")
{
$add1 = $_REQUEST['fvalue'];
$add2 = $_REQUEST['lvalue'];
$res =$add1*$add2;
}
if($operator=="/")
{
$add1 = $_REQUEST['fvalue'];
$add2 = $_REQUEST['lvalue'];
$res= $add1/$add2;
}
if($_REQUEST['fvalue']==NULL && $_REQUEST['lvalue']==NULL)
{
echo "<script language=javascript> alert(\"Please Enter values.\");</script>";
}
else if($_REQUEST['fvalue']==NULL)
{
echo "<script language=javascript> alert(\"Please Enter First value.\");</script>";
}
else if($_REQUEST['lvalue']==NULL)
{
echo "<script language=javascript> alert(\"Please Enter second value.\");</script>";
}
}
?>

For more information and inquiries, feel free to comment below or email me at [email protected]. May this simple calculator may help you in your projects or systems.

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. After downloading it, you will need a program like Winzip to decompress it.

Virus note: All files are scanned once-a-day by SourceCodester.com for viruses, but new viruses come out every day, so no prevention program can catch 100% of them.

FOR YOUR OWN SAFETY, PLEASE:

1. Re-scan downloaded files using your personal virus checker before using it.
2. NEVER, EVER run compiled files (.exe's, .ocx's, .dll's etc.)--only run source code.

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