Java gcd gcd(long x, long y)

Description

gcd

License

Apache License

Declaration

public static long gcd(long x, long y) 

Method Source Code

//package com.java2s;
/*/*from   w  w w  .  j av  a2  s  .  co  m*/
 * Copyright (C) 2015 Dell, Inc.
 * 
 * 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 {
    public static long gcd(long x, long y) {
        if (x < 0)
            x = -x;
        if (y < 0)
            y = -y;
        if (x < y) {
            long temp = x;
            x = y;
            y = temp;
        }
        long gcd = 1;
        while (y > 1) {
            if ((x & 1) == 0) {
                if ((y & 1) == 0) {
                    gcd <<= 1;
                    x >>= 1;
                    y >>= 1;
                } else {
                    x >>= 1;
                }
            } else {
                if ((y & 1) == 0) {
                    y >>= 1;
                } else {
                    x = (x - y) >> 1;
                }
            }
            if (x < y) {
                long temp = x;
                x = y;
                y = temp;
            }
        }
        return y == 1 ? gcd : gcd * x;
    }
}

Related

1. gcd(long a, long b)
2. GCD(long a, long b)
3. gcd(long a, long b)
4. gcd(long u, long v)
5. gcd(long x, long y)
6. gcd(long[] array)
7. gcd(long[] array)
8. gcd1(long given1, long given2)
9. GCDHelper(long a, long b)