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2.3 KiB
2.3 KiB
Palindrome
Library for palindrome search
Description
The palindrome library can test if a string is a palindrome and is able to find the longest palindrome within a character string.
The library is tested with an Arduino UNO, random string of 1600 characters.
Interface
- palindrome() constructor.
- int findPalindrome(const char * str, int & position, int & length) find the longest palindrome in a string. (first occurrence).
- int findEvenPalindrome(const char * str, int & position, int & length) find the longest palindrome in a string with even length. (first occurrence).
- int findOddPalindrome(const char * str, int & position, int & length) find the longest palindrome in a string with odd length. (first occurrence).
- bool isPalindrome(const char * str) checks if a string is a palindrome.
- int palindromeCount(const char * str) returns the count of matching pairs in a string. This is at most the
length / 2 + 1. - float palindromePercentage(const char * str) returns the count as percentage 0.0 .. 100.0 %
Operation
The examples show the basic working of the functions.
Questions
- is an empty string a palindrome?
Future
- update documentation
- should this be a class?
- function names?
- palindromeCount -- symmetryCount?
- palindromePercentage -- symmetryPercentage?
- improve algorithms
- merge odd / even find algorithms?
- investigate Print interface?
- investigate palindrome for numbers - radix 2..16 (36?)
- investigate case (in)sensitive flag?
- investigate ignore spaces flag?