Program to Check Palindrome Number in C

#include <stdio.h>

int reverseNum(int N) {
  
  	// Function to store the reversed number
    int rev = 0;
    while (N > 0) {

        // Extract the last digit
        int dig = N % 10;

        // Append the digit to the reversed number
        rev = rev * 10 + dig;

        // Remove the last digit
        N /= 10;
    }
    return rev;
}

int isPalindrome(int N) {
  
    // Negative numbers are not palindromes
    if (N < 0)
        return 0;
    return N == reverseNum(N);
}

int main() {
    int N = 121;
    if (isPalindrome(N)) {
        printf("Yes\n");
    }
    else {
        printf("No\n");
    }
    return 0;
}

#include <stdio.h>
#include <string.h>

int isPalindrome(int n) {
    char str[20];
  
  	// Convert the number to a string
    sprintf(str, "%d", n);

  	// Left pointer starting from the first character
    int left = 0;   
  
  	// Right pointer starting from the last character
    int right = strlen(str) - 1;

    // Loop until the pointers meet in the middle
    while (left < right) {
      
        // If mismatch is found (not a palindrome)
        if (str[left] != str[right]) {
            return 0;
        }
      	
      	// Move pointers towards each other
        left++;
        right--;
    }

    return 1;
}

int main() {
    int num = 1221;

    // Check if the number is a palindrome and print the result
    if (isPalindrome(num)) {
        printf("Yes\n");
    }
    else {
        printf("No\n");
    }

    return 0;
}