palindrome using recursion in c
/**
* C program to check palindrome number using recursion
*/
#include <stdio.h>
#include <math.h>
/* Function declarations */
int reverse(int num);
int isPalindrome(int num);
int main()
{
int num;
/* Input any number from user */
printf("Enter any number: ");
scanf("%d", &num);
if(isPalindrome(num) == 1)
{
printf("%d is palindrome number.n", num);
}
else
{
printf("%d is NOT palindrome number.n", num);
}
return 0;
}
/**
* Function to check whether a number is palindrome or not.
* This function returns 1 if the number is palindrome otherwise 0.
*/
int isPalindrome(int num)
{
/*
* Check if the given number is equal to
* its reverse.
*/
if(num == reverse(num))
{
return 1;
}
return 0;
}
/**
* Recursive function to find reverse of any number
*/
int reverse(int num)
{
/* Find number of digits in num */
int digit = (int)log10(num);
/* Recursion base condition */
if(num == 0)
return 0;
return ((num%10 * pow(10, digit)) + reverse(num/10));
}