Here you can find the source of Frac(double value)
public static double Frac(double value)
//package com.java2s; /*//from ww w . j a va 2s . com * "BSLib", Brainstorm Library. * Copyright (C) 2015 by Sergey V. Zhdanovskih. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static double Frac(double value) { return (value - Int(value)); } public static double Int(double value) { return ((value > (double) 0f) ? Math.floor(value) : Math .ceil(value)); } }