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  1. <?php
  2.  
  3. /* Я у мамы калькулятор */
  4. $input = '2+10-1+5*5=';
  5. $inputLength = mb_strlen($input);
  6.  
  7. $number = 0; /* Текущее число, которое набирает пользователь */
  8. $result = 0; /* Результат предыдущих действий */
  9. $op = ''; /* Предыдущая операция (+,-,*) */
  10.  
  11. for ($i = 0; $i < $inputLength; $i++) {
  12.     $char = mb_substr($input, $i, 1);
  13.     if ($char == '*' || $char == '+' || $char == '-' || $char == '=') {
  14. 	    intval($number);
  15. 	    echo "op=[{$op}], result = [{$result}], number = [{$number}], char = [{$char}]\n";
  16.  
  17. 	    if ($op == '+') {
  18. 	        $result = $result + $number;
  19. 			$number = 0;
  20. 			$op = $char;
  21.  
  22. 	        //return $result;
  23.  
  24. 	    }
  25. 	    elseif ($op == '-') {
  26. 	        $result = $result - $number;
  27. 			$number = 0;
  28. 			$op = $char;
  29.  
  30. 			//return $result;
  31. 	    }
  32. 	    elseif ($op == '*') {
  33. 	        $result = $result * $number;
  34. 	        $number = 0;
  35. 	        $op = $char;
  36. 	    }
  37. 	    else {
  38. 	    	$op = $char;
  39. 		    $result = $number;
  40. 		    $number = 0;
  41. 	    }
  42.  
  43. 	    if ($char == '=') {
  44. 	        echo "Результат: {$result}\n";
  45. 	        exit();
  46. 		}
  47.  
  48.  
  49.  
  50.  
  51. 	    	    //    $result = $number;
  52. 	} 
  53. 	elseif (is_numeric($char))	{
  54. 	    $number = $number * 10 + $char;
  55. 	} 
  56. 	else    {
  57. 	    echo "Неверный символ: '$char'\n";
  58. 	}
  59. }
Success #stdin #stdout 0.02s 24400KB
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stdin
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Standard input is empty
stdout
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op=[], result = [0], number = [2], char = [+]
op=[+], result = [2], number = [10], char = [-]
op=[-], result = [12], number = [1], char = [+]
op=[+], result = [11], number = [5], char = [*]
op=[*], result = [16], number = [5], char = [=]
Результат: 80
https://ideone.com/t4MwpX
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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