Here you can find the source of abs(double n)
static public final double abs(double n)
//package com.java2s; /**/*from w w w . j av a2s. c o m*/ * Copyright 2008 - 2012 * * 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. * * @project loon * @author cping * @email?javachenpeng@yahoo.com * @version 0.3.3 */ public class Main { static public final double abs(double n) { return Math.abs(n); } static public final float abs(float n) { return (n < 0) ? -n : n; } static public final int abs(int n) { return (n < 0) ? -n : n; } }