95 lines
3.6 KiB
Java
95 lines
3.6 KiB
Java
/*
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* Copyright (c) 2009, 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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/*
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* @test
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* @bug 1234567
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* @summary Test that precision() is computed properly.
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* @author Joseph D. Darcy
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*/
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import java.math.*;
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import static java.math.BigDecimal.*;
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public class PrecisionTests {
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private static BigDecimal NINE = valueOf(9);
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public static void main(String argv[]) {
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int failures = 0;
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// Smallest and largest values of a given length
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BigDecimal[] testValues = {
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valueOf(1), valueOf(9),
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};
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failures += testPrecision(new BigDecimal(0), 1);
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for(int i = 1; i < 100; i++) {
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for(BigDecimal bd : testValues) {
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failures += testPrecision(bd, i);
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failures += testPrecision(bd.negate(), i);
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}
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testValues[0] = testValues[0].multiply(TEN);
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testValues[1] = testValues[1].multiply(TEN).add(NINE);
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}
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// The following test tries to cover testings for precision of long values
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BigDecimal[] randomTestValues = {
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valueOf(2147483648L), // 2^31: 10 digits
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valueOf(-2147483648L), // -2^31: 10 digits
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valueOf(98893745455L), // random: 11 digits
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valueOf(3455436789887L), // random: 13 digits
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valueOf(140737488355328L), // 2^47: 15 digits
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valueOf(-140737488355328L), // -2^47: 15 digits
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valueOf(7564232235739573L), // random: 16 digits
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valueOf(25335434990002322L), // random: 17 digits
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valueOf(9223372036854775807L), // 2^63 - 1: 19 digits
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valueOf(-9223372036854775807L) // -2^63 + 1: 19 digits
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};
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// The array below contains the expected precision of the above numbers
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int[] expectedPrecision = {10, 10, 11, 13, 15, 15, 16, 17, 19, 19};
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for (int i = 0; i < randomTestValues.length; i++) {
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failures += testPrecision(randomTestValues[i], expectedPrecision[i]);
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}
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if (failures > 0) {
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throw new RuntimeException("Incurred " + failures +
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" failures while testing precision.");
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}
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}
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private static int testPrecision(BigDecimal bd, int expected) {
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int precision = bd.precision();
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// System.out.printf("Testing %s, expected %d%n", bd, expected);
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if (precision != expected) {
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System.err.printf("For (%s).precision expected %d, got %d%n",
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bd, expected, precision);
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return 1;
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}
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return 0;
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}
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}
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