Example: Palindrome Numbers in Range (Digit Reversal) in C

// Palindrome Numbers in Range (Digit Reversal)
#include <stdio.h>

// Function to check if a number is a palindrome
int isPalindrome(int n) {
    int originalN = n;
    int reversedN = 0;

    // Handle negative numbers (not typically considered palindromes)
    if (n < 0) {
        return 0; 
    }
    // Single digit numbers are palindromes
    if (n >= 0 && n < 10) {
        return 1;
    }

    // Reverse the number
    while (n > 0) {
        int digit = n % 10;        // Get the last digit
        reversedN = reversedN * 10 + digit; // Add digit to reversed number
        n /= 10;                   // Remove the last digit from n
    }

    return originalN == reversedN; // Compare original and reversed
}

int main() {
    int start_range, end_range;

    // Step 1: Get user input for the range
    printf("Enter the starting number of the range: ");
    scanf("%d", &start_range);
    printf("Enter the ending number of the range: ");
    scanf("%d", &end_range);

    // Step 2: Ensure valid range (start should not be greater than end)
    if (start_range > end_range) {
        int temp = start_range;
        start_range = end_range;
        end_range = temp;
    }

    // Step 3: Print header for results
    printf("Palindrome numbers in the range %d to %d are:\n", start_range, end_range);

    // Step 4: Iterate through the range and check each number
    for (int i = start_range; i <= end_range; i++) {
        if (isPalindrome(i)) {
            printf("%d ", i);
        }
    }
    printf("\n");

    return 0;
}