Java floor floorPowerOf2(final int x)

Description

Rounds down the value to the nearest lower power^2 value.

License

Open Source License

Parameter

Parameter	Description
x	a parameter

Return

power^2 value

Declaration

public static final int floorPowerOf2(final int x) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2012 Andreas H?hmann/*from  w  w  w  .  jav a 2 s.  co  m*/
 *
 * All rights reserved. Licensed 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.
 * 
 *******************************************************************************/

public class Main {
    /**
     * Log(2)
     */
    public static final float LOG2 = (float) Math.log(2);

    /**
     * Rounds down the value to the nearest lower power^2 value.
     * 
     * @param x
     * @return power^2 value
     */
    public static final int floorPowerOf2(final int x) {
        return (int) Math.pow(2, (int) (Math.log(x) / LOG2));
    }
}

Related

1. floorPlaneToPlanView(int[][] frameCells, final int h)
2. floorPositive(float value)
3. floorPot(float value)
4. floorPOT(int n)
5. floorPowerOf2(final int n)
6. floorPowerOf2(int n)
7. floorPowerOfTwo(final int a)
8. floorSec(long milli)
9. floorSec(long valueMs)