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  1. <?php
  2.  
  3. //Калькулятор 2
  4. error_reporting(-1);
  5. mb_internal_encoding('utf-8');
  6.  
  7. //$input = '243+6743-78*2='; //13816
  8. //$input = '7+2/2='; //4.5
  9. $input = "200-200=";
  10. $inputLength = mb_strlen($input);
  11.  
  12. $number = 0; //Текущее число
  13. $result = 0; //Результат предыдущих действий
  14. $op = ''; // Предыдущая операция
  15. $digit = '';
  16.  
  17. for ($i = 0; $i < $inputLength; $i++) {
  18.     $char = mb_substr($input, $i, 1);
  19.     if ($char == '*' || $char == '+' || $char == '-' || $char == '=' || $char == '/') {
  20.         $number = floatval($digit);
  21.  
  22.         if ($op == '+') {
  23.             $result += $number;
  24.         }
  25.  
  26.         if ($op == '-') {
  27.             $result -= $number;
  28.         }
  29.  
  30.         if ($op == '*') {
  31.             $result *= $number;
  32.         }
  33.  
  34.         if ($op == '/') {
  35.             $result /= $number;
  36.         }
  37.  
  38.         echo "op=[{$op}]  result = [{$result}]  number = [{$number}] char = [{$char}] \n";
  39.  
  40.         if ($result == 0) {
  41.             $result = $number;
  42.         }
  43.         $op = $char;
  44.         $digit = '';
  45.  
  46.         if ($char == "=") {
  47.             echo "Ответ: {$input}{$result}";
  48.         }
  49.  
  50.     } elseif (is_numeric($char) || $char == '.') {
  51.         $digit .= $char;
  52.     } else {
  53.         echo "Неверный символ: {$char}\n";
  54.     }
  55.  
  56. }
  57.  
Success #stdin #stdout 0.03s 52480KB
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stdin
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Standard input is empty
stdout
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op=[]  result = [0]  number = [200] char = [-] 
op=[-]  result = [0]  number = [200] char = [=] 
Ответ: 200-200=200
https://ideone.com/Hztwjm
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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