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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6. $input = '2.5+1.2=';
  7. $inputLength = mb_strlen($input);
  8.  
  9. $number = 0; /* Текущее число, которое набирает пользователь */
  10. $result = 0; /* Результат предыдущих действий */
  11. $result1 = 0;
  12. $op = ''; /* Предыдущая операция (+, -, *) */
  13. $op1 = '';
  14.  
  15.     for($i = 0; $i < $inputLength; $i++) {
  16.     	$char = mb_substr($input, $i, 1);
  17.        	if(($char == '+')||($char == '-')||($char == '*')||($char == '=')) {
  18.        		for($j = 0; $j != (($char == '+')||($char == '-')||($char == '*')); $j++) {
  19.        			if(($char == '+')||($char == '-')||($char == '*')) {
  20.        				if($op == '+') {
  21.        					$result = $result + $number;
  22.        					$op = $char;
  23.        				} elseif($op == '-') {
  24.        					$result = $result - $number;
  25.        					$op = $char;
  26.        				} elseif($op == '*') {
  27.        					$result = $result * $number;
  28.        					$op = $char;
  29.        				} else {
  30.        					$result = $number;
  31.        					$op = $char;
  32.        				}
  33.        				$number = 0;
  34.        			}
  35.        		}
  36.        		    if($char == '=') {
  37.        				if($op == '+') {
  38.        					$result = $result + $number;
  39.        				} elseif($op == '-') {
  40.        					$result = $result - $number;
  41.        				} else {
  42.        					$result = $result * $number;
  43.        				}
  44.        			}
  45.        	        var_dump('op:  ' . $op);
  46.            	    var_dump('res:  ' . $result);
  47.            	    var_dump('num:  ' . $number);
  48.            	    var_dump('char:  ' . $char);
  49.        	} elseif(is_numeric($char)||($char == '.')) {
  50.        		if(is_numeric($char)) {
  51. 			    if($op1 == '.') {
  52. 			    	for($e = 0.1; $e == is_numeric($char); $e *= 0.1) {
  53. 			    		$inc = $e;
  54.        		        $char = $char * $inc;
  55. 			    	}
  56.        			} else {
  57.        				$number = $number * 10;
  58.        			}
  59.        			$op1 = '';
  60.        		} else {
  61.        	        $op1 = $char;
  62.        		}
  63.        		    $number = $number + $char;
  64.        			var_dump('op1   '.$op1);
  65.        			var_dump('char1  '.$char);
  66.        	} else {
  67.        		echo "неверый символ: '$char' \n";
  68.        	}
  69.     }
  70. var_dump($result);
Success #stdin #stdout 0.02s 52488KB
comments (?)
stdin
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Standard input is empty
stdout
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string(6) "op1   "
string(8) "char1  2"
string(7) "op1   ."
string(8) "char1  ."
string(6) "op1   "
string(8) "char1  0"
string(6) "op:  +"
string(7) "res:  2"
string(7) "num:  0"
string(8) "char:  +"
string(6) "op1   "
string(8) "char1  1"
string(7) "op1   ."
string(8) "char1  ."
string(6) "op1   "
string(8) "char1  0"
string(6) "op:  +"
string(7) "res:  3"
string(7) "num:  1"
string(8) "char:  ="
float(3)
https://ideone.com/9zvzXf
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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