To implement a program is a function called "palindrome" that checks whether a given string is a palindrome.
A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward. In the context of strings, a palindrome is a string that remains unchanged when its characters are reversed. For example, "level," "radar," and "madam" are all palindromes.
To determine if a given string is a palindrome, we can use several approaches. Here are a few commonly used methods:
One straightforward approach is to reverse the given string and compare it with the original string. If both are the same, the string is a palindrome. This can be achieved by iterating over the characters of the string and appending them in reverse order to a new string. Finally, compare the reversed string with the original string. If they match, the string is a palindrome.
Another efficient technique involves using two pointers starting from the beginning and end of the string and moving towards each other. At each step, we compare the characters at the two pointers. If they are equal, we continue moving the pointers inward. If at any point the characters differ, the string is not a palindrome. This method only requires a single pass through the string.
We can also utilize recursion to check if a string is a palindrome. The base case for recursion would be an empty string or a string with a single character, both of which are palindromes. For longer strings, we compare the first and last characters. If they are equal, we recursively check the substring obtained by removing the first and last characters. If both the first and last characters are not equal, the string is not a palindrome.
These are some of the common approaches used to determine if a string is a palindrome. Depending on the programming language or specific requirements, there may be variations or additional techniques available.