Palindrome (String)

Our Objective

To implement a program is a function called "palindrome" that checks whether a given string is a palindrome.


The Theory

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:

Reversing the String:

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.

Two-Pointer Technique:

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.

Recursive Approach:

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.


Learning Outcomes

  • Understanding String Manipulation: Learning about palindromes helps you grasp fundamental string manipulation concepts. You become familiar with operations like string reversal, accessing characters in a string, and comparing strings.
  • Problem-Solving Skills: Solving palindrome-related problems can enhance your problem-solving skills. You'll learn to break down a problem into smaller steps, identify the most efficient solution, and implement it using the appropriate programming constructs.
  • Logic and Conditionals: Palindrome checking involves logical reasoning and the use of conditionals. You'll become proficient in constructing conditional statements based on the requirements of the problem.