Main.java Source code

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Here is the source code for Main.java

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//package com.java2s;
/*
 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */

import sun.misc.FloatConsts;
import sun.misc.DoubleConsts;

public class Main {
    /**
     * Returns the first floating-point argument with the sign of the
     * second floating-point argument.  For this method, a NaN
     * <code>sign</code> argument is always treated as if it were
     * positive.
     *
     * @param magnitude  the parameter providing the magnitude of the result
     * @param sign   the parameter providing the sign of the result
     * @return a value with the magnitude of <code>magnitude</code>
     * and the sign of <code>sign</code>.
     * @author Joseph D. Darcy
     * @since 1.5
     */
    public static double copySign(double magnitude, double sign) {
        return rawCopySign(magnitude, (isNaN(sign) ? 1.0d : sign));
    }

    /**
     * Returns the first floating-point argument with the sign of the
     * second floating-point argument.  For this method, a NaN
     * <code>sign</code> argument is always treated as if it were
     * positive.
     *
     * @param magnitude  the parameter providing the magnitude of the result
     * @param sign   the parameter providing the sign of the result
     * @return a value with the magnitude of <code>magnitude</code>
     * and the sign of <code>sign</code>.
     * @author Joseph D. Darcy
     */
    public static float copySign(float magnitude, float sign) {
        return rawCopySign(magnitude, (isNaN(sign) ? 1.0f : sign));
    }

    /**
     * Returns the first floating-point argument with the sign of the
     * second floating-point argument.  Note that unlike the {@link
     * FpUtils#copySign(double, double) copySign} method, this method
     * does not require NaN <code>sign</code> arguments to be treated
     * as positive values; implementations are permitted to treat some
     * NaN arguments as positive and other NaN arguments as negative
     * to allow greater performance.
     *
     * @param magnitude  the parameter providing the magnitude of the result
     * @param sign   the parameter providing the sign of the result
     * @return a value with the magnitude of <code>magnitude</code>
     * and the sign of <code>sign</code>.
     * @author Joseph D. Darcy
     */
    public static double rawCopySign(double magnitude, double sign) {
        return Double.longBitsToDouble((Double.doubleToRawLongBits(sign) & (DoubleConsts.SIGN_BIT_MASK))
                | (Double.doubleToRawLongBits(magnitude)
                        & (DoubleConsts.EXP_BIT_MASK | DoubleConsts.SIGNIF_BIT_MASK)));
    }

    /**
     * Returns the first floating-point argument with the sign of the
     * second floating-point argument.  Note that unlike the {@link
     * FpUtils#copySign(float, float) copySign} method, this method
     * does not require NaN <code>sign</code> arguments to be treated
     * as positive values; implementations are permitted to treat some
     * NaN arguments as positive and other NaN arguments as negative
     * to allow greater performance.
     *
     * @param magnitude  the parameter providing the magnitude of the result
     * @param sign   the parameter providing the sign of the result
     * @return a value with the magnitude of <code>magnitude</code>
     * and the sign of <code>sign</code>.
     * @author Joseph D. Darcy
     */
    public static float rawCopySign(float magnitude, float sign) {
        return Float.intBitsToFloat((Float.floatToRawIntBits(sign) & (FloatConsts.SIGN_BIT_MASK))
                | (Float.floatToRawIntBits(magnitude) & (FloatConsts.EXP_BIT_MASK | FloatConsts.SIGNIF_BIT_MASK)));
    }

    /**
     * Returns <code>true</code> if the specified number is a
     * Not-a-Number (NaN) value, <code>false</code> otherwise.
     *
     * <p>Note that this method is equivalent to the {@link
     * Double#isNaN(double) Double.isNaN} method; the functionality is
     * included in this class for convenience.
     *
     * @param   d   the value to be tested.
     * @return  <code>true</code> if the value of the argument is NaN;
     *          <code>false</code> otherwise.
     */
    public static boolean isNaN(double d) {
        return Double.isNaN(d);
    }

    /**
     * Returns <code>true</code> if the specified number is a
     * Not-a-Number (NaN) value, <code>false</code> otherwise.
     *
     * <p>Note that this method is equivalent to the {@link
     * Float#isNaN(float) Float.isNaN} method; the functionality is
     * included in this class for convenience.
     *
     * @param   f   the value to be tested.
     * @return  <code>true</code> if the argument is NaN;
     *          <code>false</code> otherwise.
     */
    public static boolean isNaN(float f) {
        return Float.isNaN(f);
    }
}