Java Number Round roundUpPower2(int i)

Description

round Up Power

License

Apache License

Declaration

static int roundUpPower2(int i) 

Method Source Code

//package com.java2s;
/*//from  w w  w . j  a  va2s  . co m
 *  Copyright 2011-2015 Cojen.org
 *
 *  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 {
    static int roundUpPower2(int i) {
        // Hacker's Delight figure 3-3.
        i--;
        i |= i >> 1;
        i |= i >> 2;
        i |= i >> 4;
        i |= i >> 8;
        return (i | (i >> 16)) + 1;
    }

    static long roundUpPower2(long i) {
        i--;
        i |= i >> 1;
        i |= i >> 2;
        i |= i >> 4;
        i |= i >> 8;
        i |= i >> 16;
        return (i | (i >> 32)) + 1;
    }
}

Related

1. roundUpLong(long value, long interval)
2. roundUpLong(long x, long blockSizePowerOf2)
3. roundUpNumberByUsingMultipleValue(double number, double multiple)
4. roundUpPOT(int value)
5. roundUpPow2(int x)
6. roundUpPower2(int v)
7. roundUpTo(double in, double del)
8. roundUpTo(int a, int quanta)
9. roundUpTo(long i, long multiple)