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  1. <?php
  2.  
  3. /**
  4.  * 12.05.2015 (8:21)
  5.  * Calculator.php
  6.  * PhpStorm
  7.  */
  8.  
  9. error_reporting(-1);
  10. header("Content-Type: text/plain; charset=utf-8");
  11. mb_internal_encoding('utf-8');
  12.  
  13. $input = '243+6743-78*2*1*1*1*1*1+4-3-3817/9=';
  14. $inputLength = mb_strlen($input);
  15.  
  16. $number = 0;
  17. $result = 0;
  18. $op = '';
  19.  
  20. echo "Пример: {$input}\n\n";
  21.  
  22. for ($i = 0; $i < $inputLength; $i++) {
  23.  
  24.     $char = mb_substr($input, $i, 1);
  25.  
  26.     if (is_numeric($char)) {
  27.         $number = ($number * 10) + intval($char);
  28.     } elseif ($char == '*' || $char == '+' || $char == '-' || $char == '=' || $char == '/') {
  29.         echo "op=[{$op}], result=[{$result}], number=[{$number}], char=[{$char}]\n";
  30.         if ($op == '') {
  31.             $result = $number;
  32.         }
  33.         if ($op == '*') {
  34.         $result *= $number;
  35.         }
  36.         if ($op == '+') {
  37.             $result += $number;
  38.         }
  39.         if ($op == '-') {
  40.             $result -= $number;
  41.         }
  42.         if ($op == '/') {
  43.             $result /= $number;
  44.         }
  45.         $number = 0;
  46.         $op = $char;
  47.     }
  48. }
  49.  
  50. echo "\nОтвет: {$result}\n";
Success #stdin #stdout 0.02s 24400KB
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Standard input is empty
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Пример: 243+6743-78*2*1*1*1*1*1+4-3-3817/9=

op=[], result=[0], number=[243], char=[+]
op=[+], result=[243], number=[6743], char=[-]
op=[-], result=[6986], number=[78], char=[*]
op=[*], result=[6908], number=[2], char=[*]
op=[*], result=[13816], number=[1], char=[*]
op=[*], result=[13816], number=[1], char=[*]
op=[*], result=[13816], number=[1], char=[*]
op=[*], result=[13816], number=[1], char=[*]
op=[*], result=[13816], number=[1], char=[+]
op=[+], result=[13816], number=[4], char=[-]
op=[-], result=[13820], number=[3], char=[-]
op=[-], result=[13817], number=[3817], char=[/]
op=[/], result=[10000], number=[9], char=[=]

Ответ: 1111.1111111111
https://ideone.com/AUYZgZ
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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