C program to check whether a number is palindrome or not

In this article you will learn about c program to check palindrome number.

What is palindrome number ?

A palindrome is a number that remains same when its digits are reversed. It’s more like mirror of its own.

For example 12321

For better understanding of program, you must be familiar with following c programming concepts

• c programming if else statement
• c programming while loop

C program to check palindrome number

/* C program to check whether given number is palindrome or not */
#include <stdio.h>

int main ()
{
   int num, reverse = 0, remainder, temp;
   // reverse is used to store to reverse number
   printf("Enter the number: ");
   scanf("%d", &num);

   temp = num; // original number is stored in temp variable

   while( temp != 0)
   {
       remainder = temp % 10;
       reverse = reverse * 10 + remainder;
       temp = temp / 10;
   }

   if (num == reverse) // checking whether num is equal to reverse
      printf("%d is a palindrome.", num);
   else
      printf("\n %d is not a palindrome.", num);
   return 0;
}

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Output

Explanation

First of all, given number is stored in temp variable. Inside while loop the original number is divided and reversed which is stored in reverse variable.

Finally, if condition checks whether the original number is equal to reverse or not.