C Program to check if a number is Palindrome or not

Published on December 18, 2016 by abundantcode

Filed under C

Last modified December 18, 2016

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Problem

Write a program in C to check whether a given number is a palindrome or not.

How to find if the number is a palindrome or not in C ?

A palindrome is a number where the reverse of a number is equal to the original number. Here’s a program in C demonstrating how to do it.

#include <stdio.h>
int main()
{
    int input, reverseNumber = 0, remainder, initialNumber;
    printf("Abundantcode.com coding sample\n");
    
    printf("Enter a number: ");
    scanf("%d", &input);

    initialNumber = input;
    while( input!=0 )
    {
        remainder = input%10;
        reverseNumber = reverseNumber*10 + remainder;
        input /= 10;
    }

    if (initialNumber == reverseNumber)
        printf("%d is a palindrome.", initialNumber);
    else
        printf("%d is not a palindrome.", initialNumber);
    
    return 0;
}

Output

Abundantcode.com coding sample

Enter a number: 121

121 is a palindrome.

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