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  1. <?php
  2.  
  3. error_reporting(-1);
  4.  
  5. $input = '243+6743-78*2=';
  6. $inputLength = mb_strlen($input);
  7.  
  8. $number = 0;
  9. $result = 0;
  10. $op = '';
  11.  
  12. for ($i = 0; $i < $inputLength; $i++) {
  13.  
  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 = $number;
  20. 				break;
  21. 			case '+':
  22. 				$result = $result + $number;
  23. 				break;
  24. 			case '-':
  25. 				$result = $result - $number;
  26. 				break;
  27. 			case '*':
  28. 				$result = $result * $number;
  29. 				break;
  30. 			case '/':
  31. 				$result = $result / $number;
  32. 				break;
  33. 		}
  34. 		$op = $char;
  35. 		$number = 0;
  36. 		if ($char == '=') {
  37. 			echo "Ответ: $input$result";
  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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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/EFeXlg
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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