1   /*
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3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5    * This code is free software; you can redistribute it and/or modify it
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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
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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
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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   */
30  
31  import java.math.*;
32  
33  public class PowTests {
34      static int zeroAndOneTests() {
35          int failures = 0;
36  
37          BigDecimal[][] testCases = {
38              {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
39              {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(0, Integer.MAX_VALUE)},
40              {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(2),              BigDecimal.valueOf(0, Integer.MAX_VALUE)},
41              {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(999999999),      BigDecimal.valueOf(0, Integer.MAX_VALUE)},
42  
43              {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
44              {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(0, Integer.MIN_VALUE)},
45              {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(2),              BigDecimal.valueOf(0, Integer.MIN_VALUE)},
46              {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(999999999),      BigDecimal.valueOf(0, Integer.MIN_VALUE)},
47  
48              {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
49              {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(1, Integer.MAX_VALUE)},
50              {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(2),              null}, // overflow
51              {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(999999999),      null}, // overflow
52  
53              {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
54              {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(1, Integer.MIN_VALUE)},
55              {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(2),              null}, // underflow
56              {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(999999999),      null}, // underflow
57          };
58  
59          for(BigDecimal[] testCase: testCases) {
60              int exponent = testCase[1].intValueExact();
61              BigDecimal result;
62  
63              try{
64                  result = testCase[0].pow(exponent);
65                  if (!result.equals(testCase[2]) ) {
66                      failures++;
67                      System.err.println("Unexpected result while raising " +
68                                         testCase[0] +
69                                         " to the " + exponent + " power; expected " +
70                                         testCase[2] + ", got " + result + ".");
71                  }
72              } catch (ArithmeticException e) {
73                  if (testCase[2] != null) {
74                      failures++;
75                      System.err.println("Unexpected exception while raising " + testCase[0] +
76                                         " to the " + exponent + " power.");
77  
78                  }
79              }
80          }
81  
82          return failures;
83      }
84  
85      public static void main(String argv[]) {
86          int failures = 0;
87  
88          failures += zeroAndOneTests();
89  
90          if (failures > 0) {
91              throw new RuntimeException("Incurred " + failures +
92                                         " failures while testing pow methods.");
93          }
94      }
95  
96  }