fork(1) download 
  1. <?php
  2.  
  3. $input = '0.5/2=';
  4. $inputLength = mb_strlen($input);
  5.  
  6. $number = 0;
  7. $result = 0;
  8. $op = '';
  9.  
  10. for ($i = 0; $i < $inputLength; $i++) {
  11.  
  12.     $char = mb_substr($input, $i, 1);
  13.     if ($char == '+' || $char == '-' || $char == '*' || $char == '='  || $char == '/') {
  14.         $number = floatval($number);
  15.         if ($op == '') {
  16.             $result = $number;
  17.         } elseif ($op == '+') {
  18.             $result += $number;
  19.         } elseif ($op == '-') {
  20.             $result -= $number;
  21.         } elseif ($op == '*') {
  22.             $result *= $number;
  23.         } elseif ($op == '/') {
  24.             $result /= $number;
  25.         }
  26.         if ($char == '=') {
  27.             echo $input . $result;
  28.         }
  29.         $op = $char;
  30.         $number = '';
  31.     } elseif (is_numeric($char)) {
  32.         $char = floatval($char);
  33.         if ($number) {
  34.             $number .= $char;
  35.         } else {
  36.             $number = $char;
  37.         }
  38.     } elseif ($char = '.') {
  39.         $number .= '.';
  40.     } else {
  41.         echo "Неверный символ: $char \n";
  42.         exit;
  43.     }
  44. }
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
0.5/2=0.25
https://ideone.com/G6zomV
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!