Question

Программа Паскаль. Проверить, является ли последовательность чисел и букв полиндромом. Желательно с объяснением, что и почему так написали. Заранее спасибо!

Answer 1

Ответ:

var

   s: string;

   f: boolean;

   len, i: byte;

begin

   write('Введите вашу строку: ');

   readln(s); //ввод строки

   len := length(s);  //определение длины строки

   f := true; //флажок палиндрома

   for i := 1 to len div 2 do

       if s[i] <> s[len-i+1] then begin //в цикле сравнивается первая половина строки со второй в обратную сторону

           writeln('Не палиндром'); //если сталкивается с несовпадением, то флажок меняется на false

           f := false;

           break;

       end;

   if f = true then  

       writeln('Палиндром');

end.

Объяснение:

Answer 2

Checking if a Sequence of Numbers and Letters is a Palindrome in Pascal

To check if a sequence of numbers and letters is a palindrome in Pascal, we can follow these steps:

1. Input the Sequence: First, we need to input the sequence of numbers and letters. 2. Remove Non-Alphanumeric Characters: We should remove any non-alphanumeric characters from the input sequence to ensure that only letters and numbers are considered in the palindrome check. 3. Convert to Lowercase: Convert all letters to lowercase to ensure case-insensitive comparison. 4. Check for Palindrome: Compare the sequence from the start and end, moving towards the middle, to determine if it's a palindrome.

Here's a sample Pascal code to achieve this:

program CheckPalindrome;
var
  input, cleanInput: string;
  i, len: integer;
  isPalindrome: boolean;
begin
  write('Enter the sequence: ');
  readln(input);

// Remove non-alphanumeric characters and convert to lowercase
  cleanInput := '';
  for i := 1 to length(input) do
  begin
    if (input[i] in ['a'..'z', '0'..'9']) then
      cleanInput := cleanInput + lowercase(input[i]);
  end;

// Check for palindrome
  len := length(cleanInput);
  isPalindrome := true;
  for i := 1 to len div 2 do
  begin
    if cleanInput[i] <> cleanInput[len - i + 1] then
    begin
      isPalindrome := false;
      break;
    end;
  end;

// Output the result
  if isPalindrome then
    writeln('The sequence is a palindrome.')
  else
    writeln('The sequence is not a palindrome.');

end.

In this code: - We input the sequence and then clean it by removing non-alphanumeric characters and converting it to lowercase. - Then, we check if the cleaned sequence is a palindrome by comparing characters from the start and end.

This approach ensures that the sequence is checked for being a palindrome while ignoring non-alphanumeric characters and considering case-insensitivity.

Note: The provided Pascal code is a sample and may need to be adapted based on specific requirements and the environment in which it will be used.