Quelle PowTests.java Sprache: JAVA

/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

/*
* @test
* @bug 4916097
* @summary Some exponent over/undeflow tests for the pow method
* @author Joseph D. Darcy
*/

import java.math.*;

public class PowTests {
    static int zeroAndOneTests() {
        int failures = 0;

        BigDecimal[][] testCases = {
            {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
            {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(0, Integer.MAX_VALUE)},
            {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(2),              BigDecimal.valueOf(0, Integer.MAX_VALUE)},
            {BigDecimal.valueOf(0, Integer.MAX_VALUE),  new BigDecimal(999999999),      BigDecimal.valueOf(0, Integer.MAX_VALUE)},

            {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
            {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(0, Integer.MIN_VALUE)},
            {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(2),              BigDecimal.valueOf(0, Integer.MIN_VALUE)},
            {BigDecimal.valueOf(0, Integer.MIN_VALUE),  new BigDecimal(999999999),      BigDecimal.valueOf(0, Integer.MIN_VALUE)},

            {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
            {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(1, Integer.MAX_VALUE)},
            {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(2),              null}, // overflow
            {BigDecimal.valueOf(1, Integer.MAX_VALUE),  new BigDecimal(999999999),      null}, // overflow

            {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(0),              BigDecimal.valueOf(1, 0)},
            {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(1),              BigDecimal.valueOf(1, Integer.MIN_VALUE)},
            {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(2),              null}, // underflow
            {BigDecimal.valueOf(1, Integer.MIN_VALUE),  new BigDecimal(999999999),      null}, // underflow
        };

        for(BigDecimal[] testCase: testCases) {
            int exponent = testCase[1].intValueExact();
            BigDecimal result;

            try{
                result = testCase[0].pow(exponent);
                if (!result.equals(testCase[2]) ) {
                    failures++;
                    System.err.println("Unexpected result while raising " +
                                       testCase[0] +
                                       " to the " + exponent + " power; expected " +
                                       testCase[2] + ", got " + result + ".");
                }
            } catch (ArithmeticException e) {
                if (testCase[2] != null) {
                    failures++;
                    System.err.println("Unexpected exception while raising " + testCase[0] +
                                       " to the " + exponent + " power.");

                }
            }
        }

        return failures;
    }

    public static void main(String argv[]) {
        int failures = 0;

        failures += zeroAndOneTests();

        if (failures > 0) {
            throw new RuntimeException("Incurred " + failures +
                                       " failures while testing pow methods.");
        }
    }

}

quality89%

¤ Dauer der Verarbeitung: 0.12 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.