1 /*
2 * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
23
24 /*
25 * @test
26 * @bug 4916097
27 * @summary Some exponent over/undeflow tests for the pow method
28 * @author Joseph D. Darcy
29 * @compile -source 1.5 PowTests.java
30 * @run main PowTests
31 */
32
33 import java.math.*;
34
35 public class PowTests {
36 static int zeroAndOneTests() {
37 int failures = 0;
38
39 BigDecimal[][] testCases = {
40 {BigDecimal.valueOf(0, Integer.MAX_VALUE), new BigDecimal(0), BigDecimal.valueOf(1, 0)},
41 {BigDecimal.valueOf(0, Integer.MAX_VALUE), new BigDecimal(1), BigDecimal.valueOf(0, Integer.MAX_VALUE)},
42 {BigDecimal.valueOf(0, Integer.MAX_VALUE), new BigDecimal(2), BigDecimal.valueOf(0, Integer.MAX_VALUE)},
43 {BigDecimal.valueOf(0, Integer.MAX_VALUE), new BigDecimal(999999999), BigDecimal.valueOf(0, Integer.MAX_VALUE)},
44
45 {BigDecimal.valueOf(0, Integer.MIN_VALUE), new BigDecimal(0), BigDecimal.valueOf(1, 0)},
46 {BigDecimal.valueOf(0, Integer.MIN_VALUE), new BigDecimal(1), BigDecimal.valueOf(0, Integer.MIN_VALUE)},
47 {BigDecimal.valueOf(0, Integer.MIN_VALUE), new BigDecimal(2), BigDecimal.valueOf(0, Integer.MIN_VALUE)},
48 {BigDecimal.valueOf(0, Integer.MIN_VALUE), new BigDecimal(999999999), BigDecimal.valueOf(0, Integer.MIN_VALUE)},
49
50 {BigDecimal.valueOf(1, Integer.MAX_VALUE), new BigDecimal(0), BigDecimal.valueOf(1, 0)},
51 {BigDecimal.valueOf(1, Integer.MAX_VALUE), new BigDecimal(1), BigDecimal.valueOf(1, Integer.MAX_VALUE)},
52 {BigDecimal.valueOf(1, Integer.MAX_VALUE), new BigDecimal(2), null}, // overflow
53 {BigDecimal.valueOf(1, Integer.MAX_VALUE), new BigDecimal(999999999), null}, // overflow
54
55 {BigDecimal.valueOf(1, Integer.MIN_VALUE), new BigDecimal(0), BigDecimal.valueOf(1, 0)},
56 {BigDecimal.valueOf(1, Integer.MIN_VALUE), new BigDecimal(1), BigDecimal.valueOf(1, Integer.MIN_VALUE)},
57 {BigDecimal.valueOf(1, Integer.MIN_VALUE), new BigDecimal(2), null}, // underflow
58 {BigDecimal.valueOf(1, Integer.MIN_VALUE), new BigDecimal(999999999), null}, // underflow
59 };
60
61 for(BigDecimal[] testCase: testCases) {
62 int exponent = testCase[1].intValueExact();
63 BigDecimal result;
64
65 try{
66 result = testCase[0].pow(exponent);
67 if (!result.equals(testCase[2]) ) {
68 failures++;
69 System.err.println("Unexpected result while raising " +
70 testCase[0] +
71 " to the " + exponent + " power; expected " +
72 testCase[2] + ", got " + result + ".");
73 }
74 } catch (ArithmeticException e) {
75 if (testCase[2] != null) {
76 failures++;
77 System.err.println("Unexpected exception while raising " + testCase[0] +
78 " to the " + exponent + " power.");
79
80 }
81 }
82 }
83
84 return failures;
85 }
86
87 public static void main(String argv[]) {
88 int failures = 0;
89
90 failures += zeroAndOneTests();
91
92 if (failures > 0) {
93 throw new RuntimeException("Incurred " + failures +
94 " failures while testing pow methods.");
95 }
96 }
97
98 }