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C > Mathematics Code Examples

C Program to check if a number is palindrome or not

C Program to check if a number is palindrome or not

If a number remains same, even if we reverse its digits then the number is known as palindrome number. For example 10201 is a palindrome number because it remains same if we reverse its digits. In this article we have shared two C programs to check if the input number is palindrome or not. 1) using while loop 2) using recursion.

/* Program to check if a number is palindrome or not
 * using while loop
 */

#include <stdio.h>
int main()
{
   int num, reverse_number=0, remainder,temp;
   printf("Enter an integer: ");
   scanf("%d", &num);

   /* Here we are generating a new number (reverse_number)
    * by reversing the digits of original input number
    */
   temp=num;
   while(temp!=0)
   {
      remainder=temp%10;
      reverse_number=reverse_number*10+remainder;
      temp/=10;
   } 

   /* If the original input number (num) is equal to
    * to its reverse (reverse_number) then its palindrome
    * else it is not.
    */ 
   if(reverse_number==num) 
      printf("%d is a palindrome number",num);
   else
      printf("%d is not a palindrome number",num);
   return 0;
}

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