C program to check whether a number is palindrome or not

Write a C program to input number from user and check number is palindrome or not using loop. How to check whether a number is palindrome or not using loop in C programming. Logic to check palindrome number in C programming.

Example

Input

Input any number: 121

Output

121 is palindrome

Required knowledge

Basic C programming, If else, While loop

What is Palindrome number?

Palindrome number is such number which when reversed is equal to the original number. For example: 121, 12321, 1001 etc.

Logic to check palindrome number

Step by step descriptive logic to check palindrome number.

  1. Input a number from user. Store it in some variable say num.
  2. Find reverse of the given number. Store it in some variable say reverse.
  3. Compare num with reverse. If both are same then the number is palindrome otherwise not.

Also learn - Program to check palindrome string.

Program to check palindrome number

/**
 * C program to check whether a number is palindrome or not
 */

#include <stdio.h>

int main()
{
    int n, num, rev = 0;

    /* Input a number from user */
    printf("Enter any number to check palindrome: ");
    scanf("%d", &n);

    /* Copy original value to 'num' to 'n'*/
    num = n; 

    /* Find reverse of n and store in rev */
    while(n != 0)
    {
        rev = (rev * 10) + (n % 10);
        n  /= 10;
    }

    /* Check if reverse is equal to 'num' or not */
    if(rev == num)
    {
        printf("%d is palindrome.", num);
    }
    else
    {
        printf("%d is not palindrome.", num);
    }

    return 0;
}

Move a step forward and learn this program using recursive approach.

Learn more - Program to check palindrome number using recursion.

Output

Enter any number to check palindrome: 121
121 is palindrome.

Happy coding 😉

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