Question 1

What is a palindrome?

Accepted Answer

A palindrome reads the same forwards and backwards. Word palindromes: 'racecar', 'level'. Sentence palindromes ignore spaces, punctuation, and case: 'A man, a plan, a canal: Panama' is a palindrome. Number palindromes: 121, 12321.

Question 2

How does the palindrome check work for sentences?

Accepted Answer

The tool normalizes the input by removing spaces, punctuation, and converting to lowercase, then compares the cleaned string with its reverse. This correctly identifies famous palindromes like 'Madam, I'm Adam' and 'Was it a car or a cat I saw?'.

Question 3

Are there notable examples of long palindromes?

Accepted Answer

One of the longest known: 'A man, a plan, a canal: Panama' (21 chars cleaned). Extremely long constructed palindromes exist (over 10,000 words) but are linguistically forced. Palindromic numbers up to millions of digits have been studied in recreational mathematics.

회문 검사

입력

출력

자주 묻는 질문