author | jrose |
Sat, 05 Oct 2013 05:30:38 -0700 | |
changeset 20528 | 0b1e2130d3f7 |
parent 19406 | 10093962bbf3 |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
11905 | 1 |
/* |
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* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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import java.math.BigInteger; |
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/** |
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* @test Test for Math.*Exact integer and long methods. |
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* @bug 6708398 |
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* @summary Basic tests for Math exact arithmetic operations. |
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* |
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* @author Roger Riggs |
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*/ |
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public class ExactArithTests { |
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/** |
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* The count of test errors. |
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*/ |
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private static int errors = 0; |
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/** |
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* @param args the command line arguments |
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*/ |
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public static void main(String[] args) { |
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testIntegerExact(); |
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testLongExact(); |
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if (errors > 0) { |
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throw new RuntimeException(errors + " errors found in ExactArithTests."); |
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} |
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} |
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static void fail(String message) { |
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errors++; |
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System.err.println(message); |
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} |
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/** |
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* Test Math.addExact, multiplyExact, subtractExact, toIntValue methods |
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* with {@code int} arguments. |
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*/ |
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static void testIntegerExact() { |
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testIntegerExact(0, 0); |
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testIntegerExact(1, 1); |
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testIntegerExact(1, -1); |
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testIntegerExact(-1, 1); |
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testIntegerExact(1000, 2000); |
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testIntegerExact(Integer.MIN_VALUE, Integer.MIN_VALUE); |
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testIntegerExact(Integer.MAX_VALUE, Integer.MAX_VALUE); |
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testIntegerExact(Integer.MIN_VALUE, 1); |
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testIntegerExact(Integer.MAX_VALUE, 1); |
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testIntegerExact(Integer.MIN_VALUE, 2); |
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testIntegerExact(Integer.MAX_VALUE, 2); |
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testIntegerExact(Integer.MIN_VALUE, -1); |
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testIntegerExact(Integer.MAX_VALUE, -1); |
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testIntegerExact(Integer.MIN_VALUE, -2); |
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testIntegerExact(Integer.MAX_VALUE, -2); |
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} |
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/** |
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* Test exact arithmetic by comparing with the same operations using long |
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* and checking that the result is the same as the integer truncation. |
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* Errors are reported with {@link fail}. |
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* |
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* @param x first parameter |
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* @param y second parameter |
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*/ |
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static void testIntegerExact(int x, int y) { |
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try { |
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// Test addExact |
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int sum = Math.addExact(x, y); |
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long sum2 = (long) x + (long) y; |
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if ((int) sum2 != sum2) { |
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fail("FAIL: int Math.addExact(" + x + " + " + y + ") = " + sum + "; expected Arithmetic exception"); |
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} else if (sum != sum2) { |
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fail("FAIL: long Math.addExact(" + x + " + " + y + ") = " + sum + "; expected: " + sum2); |
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} |
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} catch (ArithmeticException ex) { |
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long sum2 = (long) x + (long) y; |
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if ((int) sum2 == sum2) { |
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fail("FAIL: int Math.addExact(" + x + " + " + y + ")" + "; Unexpected exception: " + ex); |
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} |
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} |
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try { |
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// Test subtractExact |
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int diff = Math.subtractExact(x, y); |
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long diff2 = (long) x - (long) y; |
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if ((int) diff2 != diff2) { |
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fail("FAIL: int Math.subtractExact(" + x + " - " + y + ") = " + diff + "; expected: " + diff2); |
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} |
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} catch (ArithmeticException ex) { |
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long diff2 = (long) x - (long) y; |
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if ((int) diff2 == diff2) { |
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fail("FAIL: int Math.subtractExact(" + x + " - " + y + ")" + "; Unexpected exception: " + ex); |
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} |
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} |
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try { |
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// Test multiplyExact |
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int product = Math.multiplyExact(x, y); |
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long m2 = (long) x * (long) y; |
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if ((int) m2 != m2) { |
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fail("FAIL: int Math.multiplyExact(" + x + " * " + y + ") = " + product + "; expected: " + m2); |
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} |
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} catch (ArithmeticException ex) { |
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long m2 = (long) x * (long) y; |
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if ((int) m2 == m2) { |
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fail("FAIL: int Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex); |
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} |
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} |
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10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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135 |
try { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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// Test incrementExact |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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137 |
int inc = Math.incrementExact(x); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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138 |
long inc2 = (long) x + 1L; |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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139 |
if ((int) inc2 != inc2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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fail("FAIL: int Math.incrementExact(" + x + ") = " + inc + "; expected Arithmetic exception"); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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} else if (inc != inc2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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fail("FAIL: long Math.incrementExact(" + x + ") = " + inc + "; expected: " + inc2); |
10093962bbf3
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143 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
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144 |
} catch (ArithmeticException ex) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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parents:
11905
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changeset
|
145 |
long inc2 = (long) x + 1L; |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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parents:
11905
diff
changeset
|
146 |
if ((int) inc2 == inc2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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147 |
fail("FAIL: int Math.incrementExact(" + x + ")" + "; Unexpected exception: " + ex); |
11905 | 148 |
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19406
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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|
149 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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150 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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151 |
|
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
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152 |
try { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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parents:
11905
diff
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|
153 |
// Test decrementExact |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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154 |
int dec = Math.decrementExact(x); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
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|
155 |
long dec2 = (long) x - 1L; |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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11905
diff
changeset
|
156 |
if ((int) dec2 != dec2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
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parents:
11905
diff
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|
157 |
fail("FAIL: int Math.decrementExact(" + x + ") = " + dec + "; expected Arithmetic exception"); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
158 |
} else if (dec != dec2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
159 |
fail("FAIL: long Math.decrementExact(" + x + ") = " + dec + "; expected: " + dec2); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
160 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
161 |
} catch (ArithmeticException ex) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
162 |
long dec2 = (long) x - 1L; |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
163 |
if ((int) dec2 == dec2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
164 |
fail("FAIL: int Math.decrementExact(" + x + ")" + "; Unexpected exception: " + ex); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
165 |
|
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
166 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
167 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
168 |
|
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
169 |
try { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
170 |
// Test negateExact |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
171 |
int neg = Math.negateExact(x); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
172 |
long neg2 = -((long)x) ; |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
173 |
if ((int) neg2 != neg2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
174 |
fail("FAIL: int Math.negateExact(" + x + ") = " + neg + "; expected Arithmetic exception"); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
175 |
} else if (neg != neg2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
176 |
fail("FAIL: long Math.negateExact(" + x + ") = " + neg + "; expected: " + neg2); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
177 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
178 |
} catch (ArithmeticException ex) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
179 |
long neg2 = (long) x - 1L; |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
180 |
if ((int) neg2 == neg2) { |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
181 |
fail("FAIL: int Math.negateExact(" + x + ")" + "; Unexpected exception: " + ex); |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
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changeset
|
182 |
|
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
183 |
} |
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
184 |
} |
11905 | 185 |
} |
186 |
||
187 |
/** |
|
188 |
* Test Math.addExact, multiplyExact, subtractExact, toIntExact methods |
|
189 |
* with {@code long} arguments. |
|
190 |
*/ |
|
191 |
static void testLongExact() { |
|
192 |
testLongExactTwice(0, 0); |
|
193 |
testLongExactTwice(1, 1); |
|
194 |
testLongExactTwice(1, -1); |
|
195 |
testLongExactTwice(1000, 2000); |
|
196 |
||
197 |
testLongExactTwice(Long.MIN_VALUE, Long.MIN_VALUE); |
|
198 |
testLongExactTwice(Long.MAX_VALUE, Long.MAX_VALUE); |
|
199 |
testLongExactTwice(Long.MIN_VALUE, 1); |
|
200 |
testLongExactTwice(Long.MAX_VALUE, 1); |
|
201 |
testLongExactTwice(Long.MIN_VALUE, 2); |
|
202 |
testLongExactTwice(Long.MAX_VALUE, 2); |
|
203 |
testLongExactTwice(Long.MIN_VALUE, -1); |
|
204 |
testLongExactTwice(Long.MAX_VALUE, -1); |
|
205 |
testLongExactTwice(Long.MIN_VALUE, -2); |
|
206 |
testLongExactTwice(Long.MAX_VALUE, -2); |
|
207 |
testLongExactTwice(Long.MIN_VALUE/2, 2); |
|
208 |
testLongExactTwice(Long.MAX_VALUE, 2); |
|
209 |
testLongExactTwice(Integer.MAX_VALUE, Integer.MAX_VALUE); |
|
210 |
testLongExactTwice(Integer.MAX_VALUE, -Integer.MAX_VALUE); |
|
211 |
testLongExactTwice(Integer.MAX_VALUE+1, Integer.MAX_VALUE+1); |
|
212 |
testLongExactTwice(Integer.MAX_VALUE+1, -Integer.MAX_VALUE+1); |
|
213 |
testLongExactTwice(Integer.MIN_VALUE-1, Integer.MIN_VALUE-1); |
|
214 |
testLongExactTwice(Integer.MIN_VALUE-1, -Integer.MIN_VALUE-1); |
|
215 |
testLongExactTwice(Integer.MIN_VALUE/2, 2); |
|
216 |
||
217 |
} |
|
218 |
||
219 |
/** |
|
220 |
* Test each of the exact operations with the arguments and |
|
221 |
* with the arguments reversed. |
|
222 |
* @param x |
|
223 |
* @param y |
|
224 |
*/ |
|
225 |
static void testLongExactTwice(long x, long y) { |
|
226 |
testLongExact(x, y); |
|
227 |
testLongExact(y, x); |
|
228 |
} |
|
229 |
||
230 |
||
231 |
/** |
|
232 |
* Test long exact arithmetic by comparing with the same operations using BigInteger |
|
233 |
* and checking that the result is the same as the long truncation. |
|
234 |
* Errors are reported with {@link fail}. |
|
235 |
* |
|
236 |
* @param x first parameter |
|
237 |
* @param y second parameter |
|
238 |
*/ |
|
239 |
static void testLongExact(long x, long y) { |
|
240 |
BigInteger resultBig = null; |
|
241 |
final BigInteger xBig = BigInteger.valueOf(x); |
|
242 |
final BigInteger yBig = BigInteger.valueOf(y); |
|
243 |
try { |
|
244 |
// Test addExact |
|
245 |
resultBig = xBig.add(yBig); |
|
246 |
long sum = Math.addExact(x, y); |
|
247 |
checkResult("long Math.addExact", x, y, sum, resultBig); |
|
248 |
} catch (ArithmeticException ex) { |
|
249 |
if (inLongRange(resultBig)) { |
|
250 |
fail("FAIL: long Math.addExact(" + x + " + " + y + "); Unexpected exception: " + ex); |
|
251 |
} |
|
252 |
} |
|
253 |
||
254 |
try { |
|
255 |
// Test subtractExact |
|
256 |
resultBig = xBig.subtract(yBig); |
|
257 |
long diff = Math.subtractExact(x, y); |
|
258 |
checkResult("long Math.subtractExact", x, y, diff, resultBig); |
|
259 |
} catch (ArithmeticException ex) { |
|
260 |
if (inLongRange(resultBig)) { |
|
261 |
fail("FAIL: long Math.subtractExact(" + x + " - " + y + ")" + "; Unexpected exception: " + ex); |
|
262 |
} |
|
263 |
} |
|
264 |
||
265 |
try { |
|
266 |
// Test multiplyExact |
|
267 |
resultBig = xBig.multiply(yBig); |
|
268 |
long product = Math.multiplyExact(x, y); |
|
269 |
checkResult("long Math.multiplyExact", x, y, product, resultBig); |
|
270 |
} catch (ArithmeticException ex) { |
|
271 |
if (inLongRange(resultBig)) { |
|
272 |
fail("FAIL: long Math.multiplyExact(" + x + " * " + y + ")" + "; Unexpected exception: " + ex); |
|
273 |
} |
|
274 |
} |
|
275 |
||
276 |
try { |
|
19406
10093962bbf3
8022109: Evaluate adding incrementExact, decrementExact, negateExact to java.lang.Math
bpb
parents:
11905
diff
changeset
|
277 |
// Test incrementExact |
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resultBig = xBig.add(BigInteger.ONE); |
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long inc = Math.incrementExact(x); |
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checkResult("long Math.incrementExact", x, 1L, inc, resultBig); |
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} catch (ArithmeticException ex) { |
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if (inLongRange(resultBig)) { |
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fail("FAIL: long Math.incrementExact(" + x + "); Unexpected exception: " + ex); |
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} |
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} |
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|
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try { |
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// Test decrementExact |
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resultBig = xBig.subtract(BigInteger.ONE); |
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long dec = Math.decrementExact(x); |
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checkResult("long Math.decrementExact", x, 1L, dec, resultBig); |
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} catch (ArithmeticException ex) { |
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if (inLongRange(resultBig)) { |
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fail("FAIL: long Math.decrementExact(" + x + "); Unexpected exception: " + ex); |
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} |
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} |
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|
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try { |
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// Test negateExact |
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resultBig = xBig.negate(); |
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long dec = Math.negateExact(x); |
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checkResult("long Math.negateExact", x, 0L, dec, resultBig); |
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} catch (ArithmeticException ex) { |
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if (inLongRange(resultBig)) { |
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fail("FAIL: long Math.negateExact(" + x + "); Unexpected exception: " + ex); |
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} |
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} |
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|
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try { |
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// Test toIntExact |
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int value = Math.toIntExact(x); |
|
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if ((long)value != x) { |
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fail("FAIL: " + "long Math.toIntExact" + "(" + x + ") = " + value + "; expected an arithmetic exception: "); |
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314 |
} |
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} catch (ArithmeticException ex) { |
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if (resultBig.bitLength() <= 32) { |
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fail("FAIL: long Math.toIntExact(" + x + ")" + "; Unexpected exception: " + ex); |
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} |
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} |
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||
321 |
} |
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||
323 |
/** |
|
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* Compare the expected and actual results. |
|
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* @param message message for the error |
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* @param x first argument |
|
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* @param y second argument |
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* @param result actual result value |
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* @param expected expected result value |
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*/ |
|
331 |
static void checkResult(String message, long x, long y, long result, BigInteger expected) { |
|
332 |
BigInteger resultBig = BigInteger.valueOf(result); |
|
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if (!inLongRange(expected)) { |
|
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fail("FAIL: " + message + "(" + x + ", " + y + ") = " + result + "; expected an arithmetic exception: "); |
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} else if (!resultBig.equals(expected)) { |
|
336 |
fail("FAIL: " + message + "(" + x + ", " + y + ") = " + result + "; expected " + expected); |
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337 |
} |
|
338 |
} |
|
339 |
||
340 |
/** |
|
341 |
* Check if the value fits in 64 bits (a long). |
|
342 |
* @param value |
|
343 |
* @return true if the value fits in 64 bits (including the sign). |
|
344 |
*/ |
|
345 |
static boolean inLongRange(BigInteger value) { |
|
346 |
return value.bitLength() <= 63; |
|
347 |
} |
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348 |
} |