Java Power of 2 nextPowerOfTwo(int x)

Description

Calculate the next power of 2.

License

Apache License

Parameter

Parameter	Description
x	a parameter

Return

Smallest power of two greater than or equal to x

Declaration

public static int nextPowerOfTwo(int x) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2013 Geoscience Australia/*w ww  .  j  a v a  2 s  . com*/
 * 
 * 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 {
    /**
     * Calculate the next power of 2. If x is a power of 2, x is returned,
     * otherwise the smallest power of two that is greater than x is returned.
     * 
     * @param x
     * @return Smallest power of two greater than or equal to x
     */
    public static int nextPowerOfTwo(int x) {
        x--;
        x |= x >> 1;
        x |= x >> 2;
        x |= x >> 4;
        x |= x >> 8;
        x |= x >> 16;
        x++;
        return x;
    }
}

Related

1. nextPowerOfTwo(int x)
2. nextPowerOfTwo(int x)
3. nextPowerOfTwo(int x)
4. nextPowerOfTwo(int x)
5. nextPowerOfTwo(int x)
6. nextPowerOfTwoExact(int n)
7. nextPowerOfTwoValue(double value)
8. nextPowerTwo(int initialNum)