/* 

  Program: Even/Odd Checker (U1)

  What it does:

    - Reads an integer n from the user.

    - Uses n % 2 to determine parity (0 remainder means even).

    - Prints "even" for 0 as well (by convention, 0 is even).

  Note:

    - In C, n % 2 == 0 works for negative numbers too (e.g., -4 is even).

*/

#include <stdio.h>

int main(void) {

    int n;

    printf("Enter an integer: ");

    if (scanf("%d", &n) != 1) {

        printf("Invalid input. Please enter a valid integer.\n");

        return 0;

    }

    /* Check parity using modulus operator */

    if (n % 2 == 0) {

        printf("%d is even.\n", n);

    } else {

        printf("%d is odd.\n", n);

    }

    /* Examples:

       Input: 7   -> 7 is odd.

       Input: 0   -> 0 is even.

       Input: -8  -> -8 is even.

    */

    return 0;

}