static char rcsid[] = "$Id: gcd.c,v 1.6 2003/08/29 16:51:07 ecen2120 Exp $";

int Biggest[5] = {0, 0, 0, 0, 0};
int In = 0;

int
gcd(int x, int y)
/* Compute the greatest common divisor of two integers
 *   On exit-
 *     gcd is the greatest common divisor of x and y
 *     Biggest[In] contains the largest common divisor found by gcd since
 *       this executable was loaded
 */
{ 
  while (x != y) if (x < y) y -= x; else x -= y;

  if (x > Biggest[In]) {
    In++; if (In == 5) In = 0;
    Biggest[In] = x;
  }

  return x;
}