/* time the nap function */
main()
	{
	int i,j,k;
	long x1,x2;
	time(&x1);
	for (i=0; i<100; i++)
		nap(500);
	time(&x2);
	printf("Should have taken 50 sec, actually took %ld sec\n",x2-x1);
	}

lflush() { }