// HOWTO make C look like bash, or
// HOWTO (ab)use shortcut operators,
// by David Baird Thu Oct  6 14:28:09 MDT 2005
#include <stdio.h>

void
weasel (char *buf)
{
  unsigned int a, b, c;
  ((sscanf (buf, "%3u-%3u-%4u", &a, &b, &c) == 3) ||
   (sscanf (buf, "%3u %3u %4u", &a, &b, &c) == 3) ||
   (sscanf (buf, "(%3u) %3u-%4u", &a, &b, &c) == 3) ||
   (sscanf (buf, "%3u%3u%4u", &a, &b, &c) == 3) ||
   (printf ("You entered an invalid phone number\n") && 0)) &&
  printf ("The phone number is (%03u) %03u-%04u\n", a, b, c);
}

int
main ()
{
  weasel ("(505) 838-1234"); // The phone number is (505) 838-1234
  weasel ("505 838 1234"); // The phone number is (505) 838-1234
  weasel ("505-838-1234"); // The phone number is (505) 838-1234
  weasel ("5058381234"); // The phone number is (505) 838-1234
  weasel ("weasel"); // You entered an invalid phone number
  // *sigh* no stdio way to fix this...
  weasel ("1 2 3"); // The phone number is (001) 002-0003
  return 0;
}