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  1. <?php
  2. mb_internal_encoding('utf-8');
  3.  
  4. // куркулятор
  5. $input = '2.5+7.5/2*10=';
  6. $inputLength = mb_strlen ($input);
  7.  
  8. $result = 0; // Текущее число, которое набирает пользователь
  9. $number = 0; // Результат предыдущих действий
  10. $op = ''; // Предыдущая операция
  11. $resultatText = "Ответ: ";
  12.  
  13. for ($i = 0; $i < $inputLength; $i++) {
  14.     $char = mb_substr($input, $i, 1);
  15.     if ($char =='*' || $char =='+' || $char =='-' || $char =='=' || $char =='/') {
  16.         echo "op = [$op], result = [$result], number = [$number], char = [$char]\n";
  17.         $resultatText .= $number . $char;
  18.  
  19.         if ($op=='') {
  20.            $op = $char;
  21.            $result = $number;
  22.            $number=0;
  23.         } else {
  24.             $result = operation($result, $number, $op);
  25.             $number = 0;
  26.             $op = $char;
  27.         }      
  28.  
  29.     } elseif (is_numeric($char) | $char=='.') {
  30.         if ($number==0) {
  31.             $number = $char;
  32.         } else {
  33.             $number .= $char;
  34.         }        
  35.     } else {
  36.         echo "Неверный символ: '$char'\n";
  37.     }
  38. }
  39. echo "$resultatText$result\n";
  40.  
  41. function operation ($result, $number, $op) {
  42.     $number = floatval($number);
  43.  
  44.     if ($op =='*' ) {
  45.         $result *= $number;
  46.     } elseif ($op =='/') {
  47.         $result /= $number;
  48.     } elseif ($op =='+') {
  49.         $result += $number;
  50.     } elseif ($op =='-') {
  51.         $result -= $number;
  52.     } elseif ($op =='=') {
  53.         echo "result: $result\n";
  54.         exit();
  55.     } 
  56.     return $result;
  57. }
  58.  
  59. ?>
Success #stdin #stdout 0.02s 52472KB
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stdin
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Standard input is empty
stdout
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op = [], result = [0], number = [243], char = [+]
op = [+], result = [243], number = [6743], char = [-]
op = [-], result = [6986], number = [78], char = [*]
op = [*], result = [6908], number = [2], char = [=]
Ответ: 243+6743-78*2=13816
https://ideone.com/mHBnyI
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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