Question

Write a program for a calculator with all other operations like add, subtract, multiply, divide, exponent, concat, modulus, triggered by separate buttons in the form instead of a text field.

Answer 1

Answer:

Explanation:

"<?php

$result = """";

class calculator

{

   var $a;

   var $b;

   function checkopration($oprator)

   {

       switch($oprator)

       {

           case '+':

           return $this->a + $this->b;

           break;

           case '-':

           return $this->a - $this->b;

           break;

           case '*':

           return $this->a * $this->b;

           break;

           case '/':

           return $this->a / $this->b;

           break;

           default:

           return ""Sorry No command found"";

       }  

   }

   function getresult($a, $b, $c)

   {

       $this->a = $a;

       $this->b = $b;

       return $this->checkopration($c);

   }

}

$cal = new calculator();

if(isset($_POST['submit']))

{  

   $result = $cal->getresult($_POST['n1'],$_POST['n2'],$_POST['op']);

}

?>

<form method=""post"">

<table align=""center"">

   <tr>

       <td><strong><?php echo $result; ?><strong></td>

   </tr>

   <tr>

       <td>Enter 1st Number</td>

       <td><input type=""text"" name=""n1""></td>

   </tr>

   <tr>

       <td>Enter 2nd Number</td>

       <td><input type=""text"" name=""n2""></td>

   </tr>

   <tr>

       <td>Select Oprator</td>

       <td><select name=""op"">

           <option value=""+"">+</option>

           <option value=""-"">-</option>

           <option value=""*"">*</option>

           <option value=""/"">/</option>

       </select></td>

   </tr>

   <tr>

       <td></td>

       <td><input type=""submit"" name=""submit"" value=""                =                ""></td>

   </tr>

</table>

</form>"