Round double value Nearest - CSharp System

CSharp examples for System:Double

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Description

Round double value Nearest

Demo Code

/* HeuristicLab//w ww.  ja  v  a2 s. c o m
 * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab 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.
 *
 * HeuristicLab 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 HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
using System;

public class Main{
    private static double RoundNearest(this double value, int decimalRank) {
      var nearestDown = value.RoundDown(decimalRank);
      var nearestUp = value.RoundUp(decimalRank);

      if (nearestUp - value > value - nearestDown)
        return nearestDown;

      return nearestUp;
    }
        private static double RoundUp(this double value, int decimalRank) {
      if (decimalRank > 0) {
        var ceil = (int)Math.Ceiling(value);
        var pow = (int)Math.Pow(10, decimalRank);
        var mod = Mod(ceil, pow);
        return ceil - mod + pow;
      }
      return value.Ceil(Math.Abs(decimalRank));
    }
        private static double RoundDown(this double value, int decimalRank) {
      if (decimalRank > 0) {
        var floor = (int)Math.Floor(value);
        var pow = (int)Math.Pow(10, decimalRank);
        var mod = Mod(floor, pow);
        return floor - mod;
      }
      return value.Floor(Math.Abs(decimalRank));
    }
}

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