PHP programs to implement simple calculator operations

				
					<html> 
<head> 
<style> 
table, td, th 
{ 
border: 1px solid black;
width: 35%; 
text-align: center;
background-color: DarkGray;
} 
table 
{ 
margin: auto; 
} 
input,p 
{ 
text-align:right; 
} 
</style> 
</head> 
<body> 
<form method="post"> 
<table> 
<caption>
    <h2> SIMPLE CALCULATOR </h2>
</caption>> 
<tr><td>First Number:</td><td><input type="text" name="num1" /></td> <td rowspan="2"><input type="submit" name="submit" value="calculate"></td>
</tr> 
<tr><td>Second Number:</td><td><input type="text" name="num2"/></td>
</tr> 
</form> 
<?php 
if(isset($_POST['submit'])) // it checks if the input submit is filled 
{ 
$num1 = $_POST['num1']; 
$num2 = $_POST['num2']; 
if(is_numeric($num1) andis_numeric($num1) ) 
{ 
echo "<tr><td> Addition :</td><td><p>".($num1+$num2)."</p></td>"; echo "<tr><td> Subtraction :</td><td><p> ".($num1-$num2)."</p></td>";
echo "<tr><td> Multiplication :</td><td><p>".($num1*$num2)."</p></td>";
echo "<tr><td>Division :</td><td><p> ".($num1/$num2)."</p></td>";
echo "</table>"; 
} 
else 
{ 
echo"<script type='text/javascript' > alert(' ENTER VALID NUMBER');
</script>"; 
} 
} 
?> 
</body> 
</html>

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