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  1. <?php
  2. error_reporting(-1);
  3. $input = "243+6743-78*2=";
  4. $inputLength = mb_strlen($input);
  5.  
  6. $number = 0;
  7. $result = 0;
  8. $op = '';
  9.  
  10. for ($i = 0; $i < $inputLength; $i++) {
  11.  
  12. 	$char = mb_substr($input, $i, 1);
  13.  
  14. 	if($char == '*' || $char == '+' || $char == '-' || $char == '=') {
  15. 		switch($op) {
  16. 			case '':
  17. 				$result += $number;
  18. 				$number = 0;
  19. 				break;
  20. 			case '+':
  21. 				$result += $number;
  22. 				$number = 0;
  23. 				break;	
  24. 			case '-':
  25. 				$result -= $number;
  26. 				$number = 0;
  27. 				break;
  28. 			case '*':
  29. 				$result *= $number;
  30. 				$number = 0;
  31. 				break;
  32. 			case '/':
  33. 				$result /= $number;
  34. 				$number = 0;
  35. 				break;
  36. 		}
  37. 		$op = $char;
  38.  
  39. 		if($op == '=') {
  40. 			echo $input . $result;
  41. 		}
  42.  
  43. 	} elseif(is_numeric($char)) {
  44. 		$number = $number * 10 + intval($char);
  45. 	} else {
  46. 		echo "Wrong sign: '$char'\n";
  47. 	}
  48.  
  49. }
Success #stdin #stdout 0.02s 52432KB
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243+6743-78*2=13816
https://ideone.com/AO9sGB
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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