#include <stdio.h>

#define BAAAD_DOUBLE(x) (x*2)
#define BAD_DOUBLE(x) ((x)+(x))
#define OKAY_DOUBLE(x) ((x)*2)

int fine_double(int x) { return x*2;}

int main( int argc, char ** argv ) {

  int y = 8;
  printf("A: %d\n", BAAAD_DOUBLE(1+2));
  printf("B: %d\n", BAAAD_DOUBLE(++y));

  y = 8;
  printf("C: %d\n", BAD_DOUBLE(1+2));
  printf("D: %d\n", BAD_DOUBLE(++y));

  y = 8;
  printf("E: %d\n", OKAY_DOUBLE(1+2));
  printf("F: %d\n", OKAY_DOUBLE(++y));

  y = 8;
  printf("G: %d\n", fine_double(1+2));
  printf("H: %d\n", fine_double(++y));

  if ( argc > 1){
    printf("\nHello: %s", argv[1]);
  }

}