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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('UTF-8');
  5.  
  6. $input = "243+6743-78*2=";
  7. $inputLength = mb_strlen($input);
  8. $number = 0;
  9. $result = 0;
  10. $op = "";
  11.  
  12. for ($i = 0; $i < $inputLength; $i++) {
  13. 	$char = mb_substr($input, $i, 1);
  14. 	if ($char == "*" || $char == "+" || $char == "-" || $char == "/") {
  15. 		if ($op == "") {
  16. 		    $result = $number;
  17. 		} elseif ($op == "*") {
  18. 			$result = $result * $number;
  19. 		} elseif ($op == "+") {
  20. 			$result = $result + $number;
  21. 		} elseif ($op == "-") {
  22. 			$result = $result - $number;
  23. 		} elseif ($op == "/") {
  24. 			$result = $result / $number;
  25. 		}
  26. 		$number = 0;
  27.         $op = $char;
  28.         } elseif (is_numeric($char)) {
  29. 	    	$number = $number * 10 + intval($char);
  30. 	    } elseif ($char == "=") {
  31. 			if ($op == "+") {
  32. 				$result = $result + $number;
  33. 			} elseif ($op == "*") {
  34. 				$result = $result * $number;
  35. 		    } elseif ($op == "-") {
  36. 				$result = $result - $number;
  37.  			} elseif ($op == "/") {
  38. 				$result = $result / $number;
  39.  			}
  40. 		} else {
  41. 	        echo "Неверный символ: \"$char\". Калькулятор не может обрабатывать подобные символы!\n";
  42. 	        exit();
  43. 	    }
  44. } 			   
  45.  
  46. echo "{$input}{$result}\n";
  47.  
  48. ?>
Success #stdin #stdout 0.02s 52472KB
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Standard input is empty
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243+6743-78*2=13816
https://ideone.com/E8Xjy5
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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