#include <stdio.h>
#define MAX(x, y) ((x) > (y) ? (x) : (y))
#define IS_EVEN(n) ((n) % 2 == 0)
#define IS_EVEN_STR(n) ((n) % 2 == 0 ? "yes" : "no")

int main(int argc, char *argv[]) {
  int j, k;
  j = 10;
  k = 20;
  printf("%d\n", MAX(j, k));
  printf("%d is even: %d\n", j, IS_EVEN(j));
  printf("%d is even? %s\n", j, IS_EVEN_STR(j));
}