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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6. $input = '1+3*2/0.5=';
  7. $inputLength = mb_strlen($input);
  8. $number = 0;
  9. $result = 0;
  10. $count = 0;//считает количество цифр после точки
  11. $op = '';
  12. $decimalMark = '';
  13. if(preg_match('/[.,]{2,}/u', $input)){
  14. 	echo "Уберите лишний знак!\n";
  15. 	exit();
  16. }
  17. for($i = 0; $i < $inputLength; $i++){
  18. 	$char = mb_substr($input, $i, 1);
  19. 	if($char == ','|| $char == '.'){
  20. 		$decimalMark = $char;
  21. 	}
  22. 	if($char == '*' || $char =='+' || $char == '-' || $char == '=' || $char == '/'){
  23. 		$count = 0;
  24. 		$decimalMark = '';
  25. 		if($op == '+'){
  26. 		    $result+= $number;
  27. 		}elseif($op == '-'){
  28. 			$result-= $number;
  29. 		}elseif($op == '*'){
  30. 			$result*= $number;
  31. 		}elseif($op == '/'){
  32. 			$result/= $number;
  33. 		}else{
  34. 			$result = $number;
  35. 		}
  36. 		$op = $char;
  37. 		$number = 0;
  38. 	}elseif(is_numeric($char)){
  39. 		if($decimalMark != ''){
  40. 			$count++;
  41. 			$number = $number + $char / pow(10, $count);
  42. 			$number = floatval($number);
  43. 		}else{
  44. 		    $number = $number*10+$char;
  45. 		    $number = intval($number);
  46. 		}    
  47. 	}elseif($char == '.' || $char == ','){
  48. 	}else{
  49. 		echo "Неверный символ '$char'\n";
  50. 	}
  51. }
  52. if($op == '='){
  53. 	echo $result;
  54. }
Success #stdin #stdout 0.02s 52472KB
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https://ideone.com/qXKUpj
Kalkulyator
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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