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  1. <?php
  2.         $input = '243+6743-78*2=';
  3.         $inputLength = mb_strlen($input);
  4.  
  5.         $number = 0; /*текущее число, которое набирает пользователь*/
  6.         $result = 0;/*Результат предыдущих действий*/
  7.         $op = ''; /*предыдущая операция(+-*)*/
  8.  
  9.         for($i = 0; $i<$inputLength; $i++){
  10.             $char = mb_substr($input, $i, 1);
  11.             if($char == '+'||$char == '*'||$char == '-'||$char == '=' ){
  12.             	if($char == '='){
  13.             		switch($op){
  14.             			case '+':
  15.             				$result = $result + $number;
  16.             				break;
  17.             			case '-':
  18.             				$result = $result - $number;
  19.             				break;
  20.             			case '*':
  21.             				$result = $result * $number;
  22.             				break;
  23.             		}
  24.             		echo "Ответ: $result\n";
  25.             		exit();
  26.  
  27.             	}
  28.             	elseif($op == ''){
  29.             		$op = $char;
  30.             		$result = $number;
  31.             		$number = 0;
  32.             	}
  33.             	elseif($op == '+'){
  34.             		$result = $result + $number;
  35.             		$number = 0;
  36.             		$op = $char;
  37.             	}
  38.             	elseif($op == '-'){
  39.             		$result = $result - $number;;
  40.             		$number = 0;
  41.             		$op = $char;
  42.             	}
  43.             	elseif($op = '*'){
  44.             		$result = $result * $number;
  45.             		$number = 0;
  46.             		$op = $char;
  47.             	}
  48.  
  49.  
  50.         }
  51.         elseif(is_numeric($char)){
  52.             $number = $number * 10 + intval($char);
  53.  
  54.         }
  55.         else{
  56.             echo "Неверный символ: '$char'\n";
  57.         }
  58.         echo "op=[$op], result=[$result], number=[$number], char=[$char]\n";
  59.  
  60.  
  61.         }
Success #stdin #stdout 0.01s 24400KB
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op=[], result=[0], number=[2], char=[2]
op=[], result=[0], number=[24], char=[4]
op=[], result=[0], number=[243], char=[3]
op=[+], result=[243], number=[0], char=[+]
op=[+], result=[243], number=[6], char=[6]
op=[+], result=[243], number=[67], char=[7]
op=[+], result=[243], number=[674], char=[4]
op=[+], result=[243], number=[6743], char=[3]
op=[-], result=[6986], number=[0], char=[-]
op=[-], result=[6986], number=[7], char=[7]
op=[-], result=[6986], number=[78], char=[8]
op=[*], result=[6908], number=[0], char=[*]
op=[*], result=[6908], number=[2], char=[2]
Ответ: 13816
https://ideone.com/mN0FkZ
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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