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Showing posts with label oop. Show all posts

Wednesday, September 9, 2015

Reverse Polish notation Calculator using stack (for better understanding oop concept)

<?php

class Stack {
public $array = array();
public $index = -1;

public function isEmpty()
{
if($this->index == -1){
return true;
}else{
return false;
}
}
public function push($element)
{
$this->index++;
$this->array[$this->index] = $element;
}

public function pop()
{
//return $this->array[$this->index--];
if($this->isEmpty()){
echo 'Nothing to pop';
}else{
$element = $this->array[$this->index];
unset($this->array[$this->index]);
$this->index--;
return $element;

}

}
public function calculator($value1, $value2, $operator){
if($operator == "+"){
$result = $value1 + $value2;
} elseif($operator == "-"){
$result = $value1 - $value2;
} elseif($operator == "*"){
$result = $value1 * $value2;
} elseif($operator == "/"){
$result = $value1 / $value2;
}

return $result;
}

}
$stack = new Stack();
if(isset($_POST['numbers'])){
$numbers = trim($_POST['numbers']);
$numbers = explode(' ', $numbers);
foreach ($numbers as $number) {
if(is_numeric($number)) {
$number = intval($number);
$stack->push($number);
}else{
$value2 = $stack->pop();
$value1 = $stack->pop();
$result = $stack->calculator($value1, $value2, $number);
$stack->push($result);
}
}
$result = $stack->pop();
echo $result;
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form method="post" action="">
<input type="text" name="numbers" id="">
<input type="submit" name="submit" id="">
</form>
</body>
</html>

Monday, September 7, 2015

object oriented programming in php :: inheritance

<?php

function is_phone_number($number){
$length = strlen($number);
if($length == 11){

for ($i=0; $i < $length; $i++) {
if(ord( $number[$i]) < ord('0') || ord( $number[$i]) > ord('9')){
return false;
}
}
return true;
}
return false;
}

class Person {
public $name;
public $profession;
public $phone_number;
public function check_phone_number($phone_number){
if(is_phone_number($phone_number)){
$this->phone_number = $phone_number;
}
}
}

class Guest extends Person{
public $indian_phone_number;
public function check_indian_phone_number($phone_number){
if(is_phone_number($phone_number . '0')){
$this->indian_phone_number = $phone_number;
}
}
}

//$indian = new Guest();
//$indian->name = 'Daniel';
//$indian->profession = "Soft skill trainer";
//$indian->check_phone_number('01670978989');
//$indian->check_indian_phone_number('0123456789');
//print_r($indian);
$indian2 = new Guest();
$indian2->name = 'Vasanth';
$indian2->profession = 'Trainer';
$indian2->check_phone_number('01670978989');
$indian2->check_indian_phone_number('8008900910');
print_r($indian2);

membd

Wednesday, September 9, 2015

Reverse Polish notation Calculator using stack (for better understanding oop concept)

Monday, September 7, 2015

object oriented programming in php :: inheritance

Basic object oriented programming in php

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