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  1. <?php
  2.     mb_internal_encoding('utf-8');
  3.  
  4.     $operator = array('+', '-', '*', '=', '/');
  5.  
  6.     $input = '-2.43+3.62/2.1*9.02=';
  7.     $inputLength = mb_strlen($input);
  8.  
  9.     $numberText = '';
  10.     $result = 0;
  11.     $op = '';
  12.  
  13.     for ($i = 0; $i < $inputLength; $i++) {
  14.         $char = mb_substr($input, $i, 1);
  15.  
  16.         if (in_array($char, $operator)) {
  17.             if ($char == '=') {
  18.                 switch ($op) {
  19.                     case '+': 
  20.                         $result += floatval($numberText);
  21.                         break;
  22.                     case '-':
  23.                         $result -= floatval($numberText);
  24.                         break;
  25.                     case '*':
  26.                         $result *= floatval($numberText);
  27.                         break;
  28.                     case '/':
  29.                         $result /= floatval($numberText);
  30.                         break;
  31.                 }
  32.             } else {
  33.                 switch ($op) {
  34.                     case '':
  35.                         $result = floatval($numberText);
  36.                         break;
  37.                     case '+':
  38.                         $result += floatval($numberText);
  39.                         break;
  40.                     case '-':
  41.                         $result -= floatval($numberText);
  42.                         break;
  43.                     case '*':
  44.                         $result *= floatval($numberText);
  45.                         break;
  46.                     case '/':
  47.                         $result /= floatval($numberText);
  48.                         break;
  49.                 }
  50.             }
  51.             echo "op = [$op], number = [$numberText], result = [$result], char = [$char]\n";
  52.             $numberText = '';
  53.             $op = $char;
  54.         } elseif (is_numeric($char) || $char == '.') {
  55.             $numberText .= $char;
  56.         } else {
  57.             echo "Непонятный символ. Работа программы прекращена\n";
  58.             exit();
  59.         }
  60.     }
  61.  
  62.     echo "{$input}{$result}";
Success #stdin #stdout 0s 52488KB
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stdin
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Standard input is empty
stdout
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op = [], number = [], result = [0], char = [-]
op = [-], number = [2.43], result = [-2.43], char = [+]
op = [+], number = [3.62], result = [1.19], char = [/]
op = [/], number = [2.1], result = [0.56666666666667], char = [*]
op = [*], number = [9.02], result = [5.1113333333333], char = [=]
-2.43+3.62/2.1*9.02=5.1113333333333
https://ideone.com/a3O2X9
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
secret

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