Created
March 10, 2021 09:03
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A simple calculator in html and php
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| <?php | |
| $currentValue = 0; | |
| $input = []; | |
| function getInputAsString($values){ | |
| $o = ""; | |
| foreach ($values as $value){ | |
| $o .= $value; | |
| } | |
| return $o; | |
| } | |
| function calculateInput($userInput){ | |
| // format user input | |
| $arr = []; | |
| $char = ""; | |
| foreach ($userInput as $num){ | |
| if(is_numeric($num) || $num == "."){ | |
| $char .= $num; | |
| }else if(!is_numeric($num)){ | |
| if(!empty($char)){ | |
| $arr[] = $char; | |
| $char = ""; | |
| } | |
| $arr[] = $num; | |
| } | |
| } | |
| if(!empty($char)){ | |
| $arr[] = $char; | |
| } | |
| // calculate user input | |
| $current = 0; | |
| $action = null; | |
| for($i=0; $i<= count($arr)-1; $i++){ | |
| if(is_numeric($arr[$i])){ | |
| if($action){ | |
| if($action == "+"){ | |
| $current = $current + $arr[$i]; | |
| } | |
| if($action == "-"){ | |
| $current = $current - $arr[$i]; | |
| } | |
| if($action == "x"){ | |
| $current = $current * $arr[$i]; | |
| } | |
| if($action == "/"){ | |
| $current = $current / $arr[$i]; | |
| } | |
| if($action == "%"){ | |
| $current = $current % $arr[$i]; | |
| } | |
| $action = null; | |
| }else{ | |
| if($current == 0){ | |
| $current = $arr[$i]; | |
| } | |
| } | |
| }else{ | |
| $action = $arr[$i]; | |
| } | |
| } | |
| return $current; | |
| } | |
| $rep=""; | |
| if($_SERVER['REQUEST_METHOD'] == "POST"){ | |
| if(isset($_POST['input'])){ | |
| $input = json_decode($_POST['input']); | |
| } | |
| if(isset($_POST)){ | |
| foreach ($_POST as $key=>$value){ | |
| if($key == 'squareroot'){ | |
| $currentValue = sqrt(floatval(getInputAsString($input))); | |
| $input = []; | |
| $input[] = $currentValue; | |
| } | |
| elseif($key == 'square'){ | |
| $currentValue = pow(floatval(getInputAsString($input)),2); | |
| $input = []; | |
| $input[] = $currentValue; | |
| } | |
| elseif($key == 'equal'){ | |
| $currentValue = calculateInput($input); | |
| $input = []; | |
| $input[] = $currentValue; | |
| }elseif($key == "c"){ | |
| $input = []; | |
| $currentValue = 0; | |
| }elseif($key == "back"){ | |
| $lastPointer = count($input) -1; | |
| if(is_numeric($input[$lastPointer])){ | |
| array_pop($input); | |
| } | |
| }elseif($key != 'input'){ | |
| $input[] = $value; | |
| } | |
| } | |
| } | |
| } | |
| ?> | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Simple Calculator</title> | |
| <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous"> | |
| <style> | |
| .main { | |
| margin:10% auto; | |
| padding-left:40%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="main"> | |
| <h3>Simple Calculator</h3> | |
| <div style="border: 1px solid #ccc; border-radius: 3px; padding: 5px; display: inline-block"> | |
| <form method="post" id="form"> | |
| <input style="padding: 3px; margin: 0; min-height: 20px;" value="<?php echo getInputAsString($input);?>"> | |
| <input class="form-control" type="hidden" name="input" value='<?php echo json_encode($input);?>'/> | |
| <input class="form-control" type="text" value="<?php echo $currentValue;?>"/> | |
| <table style="width:100%;"> | |
| <tr> | |
| <td><input class="form-control" type="submit" name="c" value="C"/></td> | |
| <td><button type="submit" name="modulus" value="%">%</button></td> | |
| <td><button type="submit" name="divide" value="/">÷</button></td> | |
| <td><input class="form-control" type="submit" name="squareroot" value="√"/></td> | |
| </tr> | |
| <tr> | |
| <td><input class="form-control" type="submit" name="7" value="7"/></td> | |
| <td><input class="form-control" type="submit" name="8" value="8"/></td> | |
| <td><input class="form-control" type="submit" name="9" value="9"/></td> | |
| <td><input class="form-control" type="submit" name="square" value="^"/></td> | |
| </tr> | |
| <tr> | |
| <td><input class="form-control" type="submit" name="4" value="4"/></td> | |
| <td><input class="form-control" type="submit" name="5" value="5"/></td> | |
| <td><input class="form-control" type="submit" name="6" value="6"/></td> | |
| <td><input class="form-control" type="submit" name="multiply" value="x"/></td> | |
| </tr> | |
| <tr> | |
| <td><input class="form-control" type="submit" name="1" value="1"/></td> | |
| <td><input class="form-control" type="submit" name="2" value="2"/></td> | |
| <td><input class="form-control" type="submit" name="3" value="3"/></td> | |
| <td><input class="form-control" type="submit" name="minus" value="-"/></td> | |
| </tr> | |
| <tr> | |
| <!-- <td><button class="btn btn-primary" type="submit" name="plusminus" value="plusminus">±</button></td> --> | |
| <td><input class="form-control" type="submit" name="zero" value="0"/></td> | |
| <td><input class="form-control" type="submit" name="." value="."/></td> | |
| <td><input class="form-control" type="submit" name="equal" value="="/></td> | |
| <td><input class="form-control" type="submit" name="add" value="+"/></td> | |
| </tr> | |
| </table> | |
| </form> | |
| </div> | |
| </div> | |
| </body> | |
| </html> |
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