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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6. $input = '567*7+546-111=';
  7. $input2 = '243+257-300+55=';
  8. $inputLength = mb_strlen($input);
  9.  
  10. $number = 0;
  11. $result = 0;
  12. $op = '';
  13.  
  14. for($i = 0; $i < $inputLength; $i++) {
  15.  
  16. 	$char = mb_substr($input, $i, 1);
  17. 	//echo "Result-[{$result}], Number-[{$number}], OP-[{$op}], char-[{$char}]\n";
  18.  
  19. 	if (is_numeric($char)) {
  20. 		$number = $number * 10 + $char;
  21. 		//echo "Result-[{$result}], Number-[{$number}], OP-[{$op}], char-[{$char}]\n";
  22. 	} elseif ($char == '*' || $char == '+' || $char == '-' || $char == '=') {
  23. 		if ($op == '') {
  24. 			$result = intval($number);
  25. 			$number = 0;
  26. 			//echo "Result-[{$result}], Number-[{$number}], OP-[{$op}], char-[{$char}]\n";
  27. 		}
  28. 		elseif ($op != '') {
  29. 			if ($op == '*') {
  30. 				$result *= $number;
  31. 			} elseif ($op == '+') {
  32. 				$result += $number;
  33. 			} elseif ($op == '-') {
  34. 				$result -= $number;
  35. 			}
  36. 			//echo "Result-[{$result}], Number-[{$number}], OP-[{$op}], char-[{$char}]\n";
  37. 		}
  38. 		$op = $char;
  39. 		$number = 0;
  40. 		echo "Result-[{$result}], Number-[{$number}], OP-[{$op}], char-[{$char}]\n";
  41. 		if ($op == '=') {
  42. 			echo "{$input}{$result}";
  43. 			exit;
  44. 		}
  45.  
  46. 	}
  47. }
Success #stdin #stdout 0.01s 52488KB
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stdin
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Standard input is empty
stdout
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Result-[567], Number-[0], OP-[*], char-[*]
Result-[3969], Number-[0], OP-[+], char-[+]
Result-[4515], Number-[0], OP-[-], char-[-]
Result-[4404], Number-[0], OP-[=], char-[=]
567*7+546-111=4404
https://ideone.com/PBnVRM
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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