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  1. <?php
  2.  
  3. $input = '-243-13.5+9/2=';
  4. $result = 0;
  5. $regexp = '!([0-9\\.]+)!';
  6.  
  7. $example = preg_split($regexp, $input, 0, PREG_SPLIT_NO_EMPTY|
  8.  	       PREG_SPLIT_DELIM_CAPTURE);
  9.  
  10. $op = '+';
  11.  
  12. foreach ($example as $key => $number)
  13. 	if (preg_match($regexp, $number)) {
  14. 		switch($op) {
  15. 			case '+':
  16. 				$result += (float)$number;
  17. 				break;
  18. 			case '-':
  19. 				$result -= (float)$number;
  20. 				break;
  21. 			case '*':
  22. 				$result *= (float)$number;
  23. 				break;
  24. 			case '/':
  25. 				$result /= (float)$number;
  26. 				break;
  27. 			case '=':
  28. 				echo "Знак '=' должен быть в конце выражения";
  29. 				exit();
  30. 			default:
  31. 				echo "Неподходящий символ $number";
  32. 				exit();
  33. 		};
  34. 	} 
  35. 	elseif ($number === "=" and $key + 1 === count($example)) { 
  36.     	echo "Ответ: ", $input, $result; exit();}
  37. 	else 
  38. 		$op = $number;
  39.  
  40.  
Success #stdin #stdout 0.01s 24448KB
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Ответ: -243-13.5+9/2=-123.75
https://ideone.com/DL243G
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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