******** fig9.65 **********

	/* assign num and compute parents */

	void
	assign_num( vertex v )
	{
		vertex w;

/*1*/		num[v] = counter++;
/*2*/		visited[v] = TRUE;
/*3*/		for each w adjacent to v
/*4*/			if( !visited[w] )
			{
/*5*/				parent[w] = v;
/*6*/				assign_num( w );
			}
	}