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  1. <?php
  2.  
  3. mb_internal_encoding("UTF-8");
  4. header('Content-Type: text/plain; charset=UTF-8');
  5.  
  6. $input = '10.512/2.5*3.500+2-100='; // use dot as decimal mark
  7. $inputLength = mb_strlen($input);
  8.  
  9. $number = 0;
  10. $result = 0;
  11. $op = '';
  12.  
  13. for ($i = 0; $i < $inputLength; $i++) {
  14.  
  15.     $char = mb_substr($input, $i, 1);
  16.  
  17.     if ($char == '*' || $char == '/' || $char == '+' || $char == '-' || $char == '=') {
  18.  
  19.         $number = floatval($number);
  20.  
  21.         echo "op=[$op], result=[$result], number=[$number], char=[$char]\n";
  22.  
  23.         if (empty($op)) {
  24.             $result = $number;
  25.         }
  26.  
  27.             switch ($op) {
  28.                 case '*':
  29.                     $result = $result * $number;
  30.                     break;
  31.                 case '+':
  32.                     $result = $result + $number;
  33.                     break;
  34.                 case '-':
  35.                     $result = $result - $number;
  36.                     break;
  37.                 case '/':
  38.                     $result = $result / $number;
  39.                     break;
  40.             }
  41.  
  42.         $op = $char;
  43.  
  44.         if ($op == '=') {
  45.             echo "Ответ: $input$result";
  46.             die();
  47.         }
  48.  
  49.         $number = 0;
  50.     } elseif (is_numeric($char) || $char == '.') {
  51.         $number .= $char;
  52.     } else {
  53.         echo "Неверный символ: '$char'\n";
  54.     }
  55. }
Success #stdin #stdout 0.01s 20568KB
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Standard input is empty
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op=[], result=[0], number=[10.512], char=[/]
op=[/], result=[10.512], number=[2.5], char=[*]
op=[*], result=[4.2048], number=[3.5], char=[+]
op=[+], result=[14.7168], number=[2], char=[-]
op=[-], result=[16.7168], number=[100], char=[=]
Ответ: 10.512/2.5*3.500+2-100=-83.2832
https://ideone.com/3tkcNY
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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