Here you can find the source of floor(double x)
public static int floor(double x)
//package com.java2s; /*//from ww w .j ava 2 s .c o m * Copyright (C) 2012 CyborgDev <cyborg@alta189.com> * * This file is part of Cyborg * * Cyborg 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. * * Cyborg 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. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static int floor(double x) { int y = (int) x; if (x < y) { return y - 1; } return y; } public static int floor(float x) { int y = (int) x; if (x < y) { return y - 1; } return y; } }