Palindrome Program in Python: Check if a Number or String is Palindrome

Palindrome Program in Python: Check if a Number or String is Palindrome

Palindrome Program in Python: Check if a Number or String is a Palindrome

A palindrome is a word, phrase, number, or sequence that reads the same backward as forward. Whether it’s a number like 121 or a word like madam, a palindrome exhibits symmetry. In this guide, we’ll explore how to check if a given number or string is a palindrome using Python. This fundamental exercise in programming helps you practice key skills like loops, string manipulation, and functions.In this article, you will learn how to:
  • Check if a number is a palindrome.
  • Check if a string is a palindrome.
  • Use Python loops, slicing, and functions to perform these checks.

What is a Palindrome?

Palindrome Program in PythonA palindrome is a sequence that remains the same when reversed. Common examples of palindromes include:
  • Words: “madam”, “racecar”
  • Numbers: 121, 434
  • Phrases: “step on no pets” (ignoring spaces and punctuation)
Now, let’s dive into checking whether a number or string is a palindrome in Python.

How to Check if a Number is a Palindrome in Python

Sample Input:

mathematica
Enter the number: 454

Sample Output:

Palindrome

Algorithm for Palindrome Check on Numbers

  1. Input the number from the user.
  2. Reverse the number and compare it to the original number.
  3. If both are the same, print “Palindrome”.
  4. If not, print “Not a Palindrome”.

Method 1: Using a While Loop

In this method, we use a while loop to reverse the number and check if it matches the original.
python
# Python program to check if the number is a palindrome using a while loopn = int(input(“Enter the number: “)) reverse = 0 number = n# Reversing the given number while n != 0: remainder = n % 10 reverse = reverse * 10 + remainder n = n // 10# Check if the original number equals the reversed number if number == reverse: print(“Palindrome”) else: print(“Not a Palindrome”)

Input:

mathematica
Enter the number: 454

Output:

Palindrome

Method 2: Using a Function

Alternatively, we can use a function to reverse the number and check if it’s a palindrome.
python
# Python program to check if the number is a palindrome using a functiondef rev(temp): reverse = 0 while temp != 0: remainder = temp % 10 reverse = reverse * 10 + remainder temp = temp // 10 return reverse# Main function n = int(input(“Enter the number: “)) temp = n res = rev(temp)if res == n: print(“Palindrome”) else: print(“Not a Palindrome”)

Input:

mathematica
Enter the number: 759

Output:

css
Not a Palindrome

How to Check if a String is a Palindrome in Python

Now let’s explore how to check if a string is a palindrome. We’ll demonstrate two methods: one using slicing and another using a while loop.

Sample Input:

c
Enter the string: MADAM

Sample Output:

Palindrome

Algorithm for Palindrome Check on Strings

  1. Get the string from the user.
  2. Reverse the string and compare it to the original.
  3. If both are the same, print “Palindrome”.
  4. If not, print “Not a Palindrome”.

Method 1: Using Slicing

Slicing is a simple way to reverse a string and check for a palindrome in Python. Here’s how it’s done:
python
# Python program to check if the string is a palindrome using slicingmyStr = input(“Enter the string: “) if myStr == myStr[::-1]: # Checking if the string is equal to its reverse using slicing print(“Palindrome”) else: print(“Not a Palindrome”)

Input:

c
Enter the string: Welcome

Output:

css
Not a Palindrome

Method 2: Using a While Loop

In this method, we use a while loop to reverse the string manually and check if it’s a palindrome.
python
# Python program to check if the string is a palindrome using a while loopmyStr = input(“Enter the string: “) rev = “” j = myStr# Reverse the string using a while loop while len(j) > 0: rev = rev + j[-1] j = j[:-1]if rev == myStr: print(“Palindrome”) else: print(“Not a Palindrome”)

Input:

vbnet
Enter the string: step on no pets

Output:

Palindrome

Key Takeaways

  • Palindromes are sequences that read the same forwards and backwards.
  • Python provides several methods to check for palindromes, including while loops and slicing.
  • Understanding how to reverse numbers and strings is a fundamental skill that helps in problem-solving and coding interviews.

Conclusion

Palindrome checking is a great way to sharpen your skills in Python, especially with loops, string manipulation, and functions. Whether you’re checking numbers or strings, the techniques provided in this article will help you understand the core principles of programming while preparing you for coding challenges and interviews.

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