{"id":10754,"date":"2022-11-24T11:19:04","date_gmt":"2022-11-24T11:19:04","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=10754"},"modified":"2023-05-17T06:51:53","modified_gmt":"2023-05-17T06:51:53","slug":"python-program-to-check-palindrome-number","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/python-program-to-check-palindrome-number\/","title":{"rendered":"Python Program to Check Palindrome Number"},"content":{"rendered":"

\"\"<\/p>\n

A palindrome number is a number that reads the same forwards and backward. In other words, it remains unchanged when its digits are reversed. For example, 121, 454, and 12321 are all palindrome numbers.<\/p>\n

Palindrome numbers have interesting properties and are commonly used in number-related puzzles and programming exercises. They can also be found in various real-world applications, such as identifying symmetrical patterns or in certain number systems.<\/p>\n

What are Palindrome Numbers?<\/h2>\n

Palindrome numbers are those numbers that read the same from front and back. For instance, in the above example, the number 121 is a palindrome as when we read it from left to right, it reads 121 and from right to left also, it reads 121 only.<\/p>\n

However, the number 1212 is not a palindrome. This is because from left to right, it reads 1212 however from right to left, it reads 2121.<\/p>\n

So, now that we know what palindrome numbers are, let us now understand the approach to writing the palindrome program in Python.<\/p>\n

Understand with Example<\/h3>\n

You are given a number as input. You have to tell whether the number is Palindrome or not. For instance, consider the 2 inputs shown below.<\/p>\n

\"\"<\/p>\n

So, before understanding the solution, let us first understand what are the palindrome numbers.<\/p>\n

How to Check Given Number is Palindrome using Reversal Method<\/h2>\n

As we can see that the meaning of a palindrome is so simple, and so is the approach to this solution. We can clearly see from the above example that a palindrome will remain the same if we reverse the digits.<\/p>\n

For instance, if there is a number 1002 and we reverse its digits, the number becomes 2001. Since the number and its reverse are not equal, this number is not a palindrome. However, the number 1001 on reversing gives 1001. Since the number and its reverse are equal, 1001 is a palindrome.<\/p>\n

So, now we just need to understand the algorithm to reverse a number. This is shown below.<\/p>\n

Reverse a Number in Python<\/h3>\n

In order to reverse a number in Python, we will follow the following algorithm.<\/p>\n

    \n
  1. Initialize the variable reverse = 0.<\/li>\n
  2. Take the modulus of the number by 10. This will be stored in the variable rem i.e. remainder.<\/li>\n
  3. Now, do rev = rev * 10 + rem.<\/li>\n
  4. Divide the number by 10. Please note that here you have to perform integer or floor division i.e. don\u2019t do N\/10, instead do N\/\/10.<\/li>\n
  5. Repeat the steps from 2 to 4 till the number becomes 0.<\/li>\n<\/ol>\n

    So, let us take example 98634 as shown below.<\/p>\n

    \"\"<\/p>\n

    So, in the first step, we have rev = 4, and the number is reduced to 9863. Now, let us divide the number by 10 again.<\/p>\n

    \"\"<\/p>\n

    So, in the second step, we have rev = 43, and the number is reduced to 986. Now, let us divide the number by 10 again.<\/p>\n

    \"\"<\/p>\n

    So, in the third step, we have rev = 436, and the number is reduced to 98. Now, let us divide the number by 10 again.<\/p>\n

    \"\"<\/p>\n

    So, in the fourth step, we have rev = 4368, and the number is reduced to 9. Now, let us divide the number by 10 again.<\/p>\n

    \"\"<\/p>\n

    So, in the fourth step, we have rev = 43689, and the number is reduced to 0. Since the number has now become 0, we will stop the division.<\/p>\n

    So, now that we know how to reverse a number in Python, what we have to do is to reverse the input number. If the reverse is the same as the input number, then we can say that the input number is a palindrome, else it is not a palindrome.<\/p>\n

    Now that we have understood the procedure, let us write the code for the same.<\/p>\n

    Program to Check Palindrome Number in Python<\/h2>\n\t\t\t\t\t\t