C Program to Check Palindrome Number

This program checks whether the entered integer is a palindrome number or not by reversing its digits and comparing it with the original number.

Concept Overview

A palindrome number remains the same when its digits are reversed. For example, 121, 1331, and 1221 are palindrome numbers. The program reverses the number using arithmetic operations and compares it with the original value.

Program

#include <stdio.h>

int main() {
    int num, originalNum, reversed = 0, remainder;

    printf("Enter a number: ");
    scanf("%d", &num);

    originalNum = num;

    while (originalNum != 0) {
        remainder = originalNum % 10;
        reversed = reversed * 10 + remainder;
        originalNum /= 10;
    }

    if (reversed == num)
        printf("%d is a palindrome number.\n", num);
    else
        printf("%d is not a palindrome number.\n", num);

    return 0;
}

Sample Output

Enter a number: 1221
1221 is a palindrome number.

Enter a number: 1234
1234 is not a palindrome number.

Explanation

• The program stores the original number in a temporary variable.
• It reverses the number by repeatedly extracting digits using `%` and constructing the reverse using multiplication and addition.
• Finally, it compares the reversed number with the original number.
• If both are equal, it is a palindrome number.