#include <stdio.h>
#include <sysexits.h>
#include <stdlib.h>

/**
 * example00 - A first example of the problems of not knowing order
 *   of operations.
 */
int
main (int argc, char *argv[])
{
  if (argc != 2)
    {
      printf ("Usage: example00 #\n");
      return EX_USAGE;
    }

  int x = atoi (argv[1]);

  printf ("Bad approach.\n");
  if (0 <= x <= 5) // 0 <= 6 true, value 1;  1 <= 5 // 0 <= -5 false, value 0
    printf ("%d is in the range [0..5].\n", x);
  else
    printf ("%d is NOT in the range [0..5]\n", x);

  printf ("Good approach.\n");
  if (0 <= x && x <= 5) // <= has higher precedence than &&
    printf ("%d is in the range [0..5].\n", x);
  else
    printf ("%d is NOT in the range [0..5]\n", x);

  return EX_OK;
} // main