A simple php program to perform basic math operations using addition, subtraction, multiplication and division by asking the user to give two numbers and select the operations using drop-down menu in HTML.
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Program Listing
<?php
$num1 = $num2 = $oper = $answer = $infotext = "";
if(isset($_POST['btnSolve']))
{
$num1 = $_POST['txtNum1'];
$num2 = $_POST['txtNum2'];
$oper = $_POST['txtOper'];
switch ($oper) {
case "Addition":
$answer = $num1 + $num2;
$infotext = $num1." + ".$num2;
break;
case "Subtraction":
$answer = $num1 - $num2;
$infotext = $num1." - ".$num2;
break;
case "Multiplication":
$answer = $num1 * $num2;
$infotext = $num1." x ".$num2;
break;
case "Division":
$answer = $num1 / $num2;
$infotext = $num1." / ".$num2;
break;
}
$answer='<div class="answer">'.$infotext.' = '.$answer.'</div>';
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Basic Math Operations in PHP Using Drop Down Menu</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<h3 align="center"> Basic Math Operations in PHP Using Drop Down Menu</h3>
<main>
<div class="container">
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<label for="txtNum1"><b>First Number:</b></label>
<input type="number" name="txtNum1" id="txtNum1" value="<?php echo $num1; ?>" required>
<label for="txtNum2"><b>Second Number:</b></label>
<input type="number" name="txtNum2" id="txtNum2" value="<?php echo $num2; ?>" required>
<label for="txtOper"><b>Select Operator:</b></label>
<select name="txtOper" id="txtOper" value="<?php echo $oper; ?>" required>
<option value="Addition">Addition</option>
<option value="Subtraction">Subtraction</option>
<option value="Multiplication">Multiplication</option>
<option value="Division">Division</option>
</select>
<button type="submit" name="btnSolve" class="btnSolve">Solve</button>
<?php echo $answer;?>
</form>
</div>
</main>
</body>
</html>
style.css
* {
box-sizing: border-box;
}
body {
font-family: Arial, Helvetica, sans-serif;
background: #fefefe;
color: #1a1a1a;
font-size: 15px;
}
main {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 450px;
box-shadow: rgba(99, 99, 99, 0.2) 0px 2px 8px 0px;
border-radius: 10px;
}
.container {
display: block;
padding: 30px;
background: #fff;
text-align: left;
border-radius: 2px;
}
input,
select {
display: inline-block;
background: #f5f5f5;
width: 100%;
margin: 5px 0 20px 0;
padding: 15px;
border: none;
font-size: 15px;
}
input:focus,
select:focus {
background: #eeeeee;
outline: none;
}
button {
background: #2196f3;
color: #fff;
padding: 10px 20px;
margin: 10px 0 0;
border: none;
cursor: pointer;
width: 100%;
opacity: 0.9;
text-transform: uppercase;
font-size: 15px;
outline: none;
}
button:hover {
opacity: 1;
}
.answer {
padding: 20px;
margin-top: 20px;
text-align: center;
font-size: 30px;
font-weight: bold;
background: #dadada;
}
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