Android Open Source - saldo Number Util

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Back to project page saldo.

License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Saldo - http://github.com/kria/saldo/*from  w  w w.ja  v  a 2  s  . c om*/
 * 
 * Copyright (C) 2010 Kristian Adrup
 * 
 * This file is part of Saldo.
 * 
 * Saldo 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.
 *
 * Saldo 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/>.
 */

package com.adrup.util;

/**
 * Misc utils concerning numbers.
 * 
 * @author Kristian Adrup
 *
 */
public class NumberUtil {

  public static double roundToSignificantFigures(double num, int n) {
      if(num == 0) {
          return 0;
      }

      final double d = Math.ceil(Math.log10(num < 0 ? -num: num));
      final int power = n - (int)d;

      final double magnitude = Math.pow(10, power);
      final long shifted = Math.round(num * magnitude);
      return shifted/magnitude;
  }
  
  public static long roundToSignificantFigures(long num, int n) {
    return (long)roundToSignificantFigures((double) num, n);
  }
}

Java Source Code List