Livelock.java revision 1870:4aa2e64eff30 
1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @summary Busy infinite loop client, calculating E number
27 */
28public class Livelock {
29
30    public static double elim;
31
32    public static void main(String[] args) {
33        System.out.printf(
34                "%24s  %24s  %24s  %24s  %24s  %24s%n",
35                "n", "n!", "e = lim(...)", "e = taylor series",
36                "err e-lim", "err e-taylor");
37
38        while (true) {
39            double esum = 2;
40            double nfac = 1;
41            double iter = 1;
42            for (double n = 1; !Double.isInfinite(n) && !Double.isNaN(n) ; n = n * 2) {
43                elim = Math.pow(1 + 1 / n, n);
44
45                iter += 1;
46                nfac *= iter;
47                esum += 1 / nfac;
48
49                System.out.printf("% 24.16e  % 24.16e  % 24.16e  % 24.16e"
50                                + "%- 24.16e  %- 24.16e%n",
51                        n, nfac, elim, esum, (Math.E - elim), (Math.E - esum));
52            }
53        }
54    }
55}
56