/*

 * Copyright (c) 1998, 2011, 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 4101566 4831589

 * @summary Check for correct implementation of Math.rint(double)

 */

import sun.misc.DoubleConsts;

public class Rint {

    static int testRintCase(double input, double expected) {

        int failures = 0;

        double result;

        failures += Tests.test("Math.rint",  input, Math.rint(input),   expected);

        failures += Tests.test("Math.rint", -input, Math.rint(-input), -expected);

        failures += Tests.test("StrictMath.rint",

                               input, StrictMath.rint(input),   expected);

        failures += Tests.test("StrictMath.rint", -input,

                               StrictMath.rint(-input), -expected);

        return failures;

    }

    public static void main(String args[]) {

        int failures = 0;

        double twoToThe52 = Math.scalb(1.0, 52); // 2^52

        double [][] testCases = {

            {0.0,                               0.0},

            {Double.MIN_VALUE,                  0.0},

            {Math.nextDown(DoubleConsts.MIN_NORMAL), 0.0},

            {DoubleConsts.MIN_NORMAL,           0.0},

            {0.2,                               0.0},

            {Math.nextDown(0.5),             0.0},

            {              0.5,              0.0},

            {  Math.nextUp(0.5),             1.0},

            {0.7,                               1.0},

            {Math.nextDown(1.0),             1.0},

            {              1.0,              1.0},

            {  Math.nextUp(1.0),             1.0},

            {Math.nextDown(1.5),             1.0},

            {              1.5,              2.0},

            {  Math.nextUp(1.5),             2.0},

            {4.2,                               4.0},

            {4.5,                               4.0},

            {4.7,                               5.0},

            {7.5,                               8.0},

            {7.2,                               7.0},

            {7.7,                               8.0},

            {150000.75,                         150001.0},

            {300000.5,                          300000.0},

            {Math.nextUp(300000.5),          300001.0},

            {Math.nextDown(300000.75),       300001.0},

            {300000.75,                         300001.0},

            {Math.nextUp(300000.75),         300001.0},

            {300000.99,                         300001.0},

            {262144.75,                         262145.0}, //(2^18 ) + 0.75

            {499998.75,                         499999.0},

            {524287.75,                         524288.0}, //(2^19 -1) + 0.75

            {524288.75,                         524289.0},

            {Math.nextDown(twoToThe52),      twoToThe52},

            {twoToThe52,                        twoToThe52},

            {Math.nextUp(twoToThe52),        Math.nextUp(twoToThe52)},

            {Double.MAX_VALUE,          Double.MAX_VALUE},

            {Double.POSITIVE_INFINITY,  Double.POSITIVE_INFINITY},

            {Double.NaN,                        Double.NaN}

        };

        for(int i = 0; i < testCases.length; i++) {

            failures += testRintCase(testCases[i][0], testCases[i][1]);

        }

        // Test values throughout exponent range

        for(double d = Double.MIN_VALUE;

            d < Double.POSITIVE_INFINITY; d *= 2) {

            failures += testRintCase(d, ((d<=0.5)?0.0:d));

        }

        if (failures > 0) {

            System.err.println("Testing {Math, StrictMath}.rint incurred "

                               + failures + " failures.");

            throw new RuntimeException();

        }

    }

}