Here you can find the source of sum(double x, double y)
static double sum(double x, double y)
//package com.java2s; /* ============================================================ * JRobin : Pure java implementation of RRDTool's functionality * ============================================================ * * Project Info: http://www.jrobin.org/*from w w w. j av a 2 s. c o m*/ * Project Lead: Sasa Markovic (saxon@jrobin.org); * * (C) Copyright 2003, by Sasa Markovic. * * Developers: Sasa Markovic (saxon@jrobin.org) * Arne Vandamme (cobralord@jrobin.org) * * This library is free software; you can redistribute it and/or modify it under the terms * of the GNU Lesser General Public License as published by the Free Software Foundation; * either version 2.1 of the License, or (at your option) any later version. * * This library 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License along with this * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. */ public class Main { static double sum(double x, double y) { return Double.isNaN(x) ? y : Double.isNaN(y) ? x : x + y; } }