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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding("utf-8");
  5.  
  6. $input = '243+6743/3-78*2=';
  7. $inputLength = mb_strlen($input);
  8.  
  9. $number = 0 ; 	// Текущее число, которое набирает пользователь
  10. $result = 0;	// Результат предыдущих действий
  11. $op = '';	// Предыдущая операция
  12.  
  13. for ($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 = [{$char}]\n";
  17.     switch($op){
  18.       case '*':
  19. 	$result = $result * $number;
  20. 	break;
  21.       case '+':
  22. 	$result = $result + $number;
  23. 	break;
  24.       case '-':
  25. 	$result = $result - $number;
  26. 	break;
  27.       case '/':
  28. 	$result = round($result / $number,2);
  29. 	break;
  30.     	default:
  31. 	$result = $number;
  32. 	break;
  33.     }
  34.     $op = $char;
  35. 	$number = 0;
  36.       if($char == '='){
  37. 	  echo "Ответ: {$input}{$result}\n";
  38. 	  exit();
  39.       }
  40.   }elseif (is_numeric($char)){
  41.     $number = $number*10+intval($char);
  42.   }else{
  43.     echo "Неверный символ: '$char'\n";
  44.   }
  45. }
Success #stdin #stdout 0.02s 24400KB
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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 = [3], char = [-]
op = [-], result = [2328.67], number = [78], char = [*]
op = [*], result = [2250.67], number = [2], char = [=]
Ответ: 243+6743/3-78*2=4501.34
https://ideone.com/ZjAixJ
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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