Program to Check if a Number is a Palindrome in C

Palindrome Number

A palindrome number is a number that remains the same when its digits are reversed. For example, 121 and 1331 are palindrome numbers.

We will explore a method to check if a number is a palindrome using C programming.

Method: Using a while Loop

We reverse the number and compare it with the original number.

#include <stdio.h>

int main() {
    int num, originalNum, reversed = 0, digit;
    
    // Prompt user for input
    printf("Enter a number: ");
    scanf("%d", &num);
    
    originalNum = num; // Store original number
    
    // Loop to extract and reverse digits
    while (num > 0) {
        digit = num % 10; // Extract last digit
        reversed = reversed * 10 + digit; // Construct reversed number
        num /= 10; // Remove last digit from number
    }
    
    // Check if original and reversed numbers are the same
    if (originalNum == reversed)
        printf("%d is a palindrome number", originalNum);
    else
        printf("%d is not a palindrome number", originalNum);
    
    return 0;
}
            

Output:

Enter a number: 121
121 is a palindrome number