How to create a simple calculator using PHP

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Single form multiple button calculator


 <code>

/// ///authour: thushara kasun ranawaka ///program:- simple calculator
///

 <html>
<body>

 <form action="hello.php" method="post">number 1:<input type="text"
name="no1"></br>
number 2:<input type="text" name="no2"></br>
<button type="submit" name="add">+</button>
<button type="submit" name="sub">-</button>
<button type="submit" name="mul">*</button>
<button type="submit" name="div">/</button>
<button type="submit" name="pow">^</button>

 <?php
if(isset($_POST['add'])) { echo '</br>'.'answer is:- '.add($_POST['no1'],$_POST['no2']); }
else if(isset($_POST['sub'])){echo '</br>'.'answer is:- '.sub($_POST['no1'],$_POST['no2']); }
else if(isset($_POST['mul'])) {  echo '</br>'.'answer is:- '.mul($_POST['no1'],$_POST['no2']); }
else if(isset($_POST['div'])){echo '</br>'.'answer is:- '.div($_POST['no1'],$_POST['no2']); }
else if(isset($_POST['pow'])) {  echo '</br>'.'answer is:- '.pow1($_POST['no1'],$_POST['no2']); }

 function add($x,$y){
if(filter_var($x, FILTER_VALIDATE_INT) && filter_var($y, FILTER_VALIDATE_INT))return $x+$y;
else return "please enter valid numaric numbers";
}
function sub($x,$y){
if(filter_var($x, FILTER_VALIDATE_INT) && filter_var($y, FILTER_VALIDATE_INT))return $x-$y;
else return "please enter valid numaric numbers";
}
function mul($x,$y){
if(filter_var($x, FILTER_VALIDATE_INT) && filter_var($y, FILTER_VALIDATE_INT))return $x*$y;
else return "please enter valid numaric numbers";
}
function div($x,$y){
if(filter_var($x, FILTER_VALIDATE_INT) && filter_var($y, FILTER_VALIDATE_INT))return $x/$y;
else return "please enter valid numaric numbers";

 }

 function pow1($x,$y){
$ans=1;
if(filter_var($x, FILTER_VALIDATE_INT) && filter_var($y, FILTER_VALIDATE_INT)){
for($i=0;$i<$y;$i++){

 $ans=$ans*$x;
}
return $ans;
}
else return "please enter valid numaric numbers";
}
?>

 </body>
</html>



</code>

 thank you everybody see you soon :)

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