Decrements the given number down to the closest power of two. - Java java.lang

Java examples for java.lang:Math Calculation

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Description

Decrements the given number down to the closest power of two.

Demo Code

/*//from w w  w.  ja  v  a 2 s .c  o m
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;

public class Main {
    /**
     * Decrements the given number down to the closest power of two. If the argument is a
     * power of two, it remains unchanged.
     * 
     * @param value The value to round down.
     * @return The closest value that is a power of two and less or equal than the given value.
     */
    public static int roundDownToPowerOf2(int value) {
        return Integer.highestOneBit(value);
    }
}

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