// Source: "Software Design ...", John A Robinson, Newnes, 2004, page 222.
struct item {
	item *pnext;
	int value;
	};
int search(int x)
	{
	extern item zeroitem;
	int i = 0;
	item *p = &zeroitem;
	while ((p = p->pnext) != 0)
		{
		if (p->value == x)
			return(i);
		i++;
		}
	return(-1);
	}