A simple Calculator Example Using OOP - PHP

cyberpirate

A simple code for a calculator using OOP approach is given below..;)..

<html>
<head>
<h1 align='center'>Its a simple calculator Program using OOP approach. </h1>
<title> Calculator</title>
</head>
<body>
<?php                 //starting the php code
class calc {         //declaring a class with name calc
private $txt3;        //declaring a private property for class calc, which can be access with in the class and hide from outside world.
public function setdata($txt1,$txt2) {   //declaring a method to set the data for the property.
if($txt2=='0')                           //To check if the value of second number is zero or not. If it is zero then print the error message.
{
echo "Error:-Second number must be a digit except a 0 !!!";
$this->txt3='Error';
}
elseif($_POST['cal']=='add')       //To check if add is selected or not when submitting a form. If it is selected go with in the if and do addition.
{
$this->txt3=$txt1+$txt2;           //Use of this variable to refer txt3 to itself.
}
elseif($_POST['cal']=='sub')       //To check if sub is selected or not when submitting a form. If it is selected go with in the if and do substraction.
{
$this->txt3=$txt1-$txt2;
}
elseif($_POST['cal']=='mul')   //To check if mul is selected or not when submitting a form. If it is selected go with in the if and do multipliction.
{
$this->txt3=$txt1*$txt2;
}
else                           //this is the else statement for the divide.
$this->txt3=$txt1/$txt2;
}

public function getdata()       //declaring the method to show the output.
{
echo "<p align='center'><font color='red' size='5px'><u><b><i>Result is: $this->txt3</i></b></u></font></p>";
}
}
$obj1=new calc();           //creating an object for class calc to provide service to the client.
$obj1->setdata($_POST['txt1'],$_POST['txt2']); //calling the object method to set the data with arguments passed by the user using form.
$obj1->getdata();                       // calling the object method to get the output.
?>
<form action='test.php' method='post'>
Number 1:-<input type='text' name='txt1' /> <br /><br />
Number 2:-<input type='text' name='txt2' /><br /><br />
<input type='radio' name='cal' value='add' >add</input>
<input type='radio' name='cal' value='sub' >sub</input>
<input type='radio' name='cal' value='mul' >mul</input>
<input type='radio' name='cal' value='div' >div</input><br/><br/>
<input type='submit' name='submit' value='submit'/>
</form>

</body>
</html>

All of the code is explained before or using the comments in the code. Thus I am not going to explain it again...;).. Thank you..:).. Hope this will help you guys..:)

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