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Showing posts with label calculator. 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>

Tuesday, August 25, 2015

Creating a Basic Calculator using PHP

<?php
$errors = array();
if ( $_SERVER['REQUEST_METHOD'] == 'POST'){

if(!isset($_POST['value1']) || trim($_POST['value1']) == ""){
$errors[] = "You must enter first Number";
} elseif(!is_numeric($_POST['value1'])) {
$errors[] = "You must put numeric value in first number field";
}else{
$value1 =$_POST['value1'];
}

if(!isset($_POST['value2']) || trim($_POST['value1']) == ""){
$errors[] = "You must enter Second Number";
} elseif(!is_numeric($_POST['value2'])) {
$errors[] = "You must put numeric value in 2nd number field";
}else{
$value2 =$_POST['value2'];
}

if(empty($_POST['value3'])){
$errors[] = "You must enter a operator";
}elseif( $_POST['value2'] == 0 && $_POST['value3'] == "/") {
$errors[] = "Second Number can't be zero in division";
} else {
$operator =$_POST['value3'];
}

if(empty($errors)){
if($operator == "+"){
$result = $value1 + $value2;
} elseif($operator == "-"){
$result = $value1 - $value2;
} elseif($operator == "*"){
$result = $value1 * $value2;
} elseif($operator == "/"){
$result = $value1 / $value2;
}else{
$errors[] = "Currently our supporting operator is +-*/";
}
}
}
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
body{
font-family: arial, sans-serif;
}
label {
display: block;
}
</style>
</head>
<body>
<form action="" method="post">
<label>First Number:</label> <input type="text" name="value1" placeholder="Number one"><br><br>
<label for="">Second Number:</label> <input type="text" name="value2" placeholder="Number Two"><br><br>
<label for="">Operator(currently supported operator is +-*/):</label><input type="text" name="value3" placeholder="operator"><br><br>
<input type="submit" name="submit" id="submit">
</form>
<div id="result">
<?php
if(isset($result)){
echo $result;
}
if(isset($errors)){
foreach($errors as $error){
echo $error . "<br>";
}

}
?>
</div>
</body>
</html>

Friday, August 21, 2015

calculator using javascript

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>calculator</title>
</head>
<body>
Number 1: <input type="text" name="" id="number_one"> <br><br>
Number 2: <input type="text" name="" id="number_two"> <br><br>
operator: <input type="text" name="" id="operator"> <br><br>
<button onclick="calculator()">Click for result</button>
<p>Result:</p>
<div id="result"></div>
<script>
function calculator(){
var number_one = Number(document.getElementById('number_one').value);
var number_two = Number(document.getElementById('number_two').value);
var operator = document.getElementById('operator').value;
var result_div = document.getElementById('result');
var result;
if(isNaN(number_one) || isNaN(number_two)){
result = "You have to enter a valid number";
} else {
if(operator == '+'){
result = number_one + number_two;
} else if(operator == '-'){
result = number_one - number_two;
} else if ( operator == '*' ){
result = number_one * number_two;
} else if (operator == "/"){
if(number_two == 0){
result = "In division second number can't be zero";
} else {
result = number_one / number_two;
}
} else {
result = "Currently our calculator only support + - * /";
}
}
result_div.innerHTML = result;
}
</script>
</body>
</html>