Check if two doubles are equal to within specified tolerance. - Java java.lang

Java examples for java.lang:double

  1. HOME
  2. Java
  3. java.lang
  4. double

Description

Check if two doubles are equal to within specified tolerance.

Demo Code

/*//from   w  ww .  j a  v a2s. c  o  m
 * Copyright (c) 2014. Real Time Genomics Limited.
 *
 * Use of this source code is bound by the Real Time Genomics Limited Software Licence Agreement
 * for Academic Non-commercial Research Purposes only.
 *
 * If you did not receive a license accompanying this file, a copy must first be obtained by email
 * from support@realtimegenomics.com.  On downloading, using and/or continuing to use this source
 * code you accept the terms of that license agreement and any amendments to those terms that may
 * be made from time to time by Real Time Genomics Limited.
 */
//package com.java2s;

public class Main {
    /**
     * Check if two doubles are equal to within specified tolerance.
     * @param a parameter
     * @param b parameter
     * @param tolerance allowance for difference between a and b.
     * @return true iff (a ~= b)
     */
    public static boolean approxEquals(final double a, final double b,
            final double tolerance) {
        if (Double.isNaN(a) || Double.isNaN(b)) {
            return false;
        }
        if (a == b) {
            return true;
        }
        if (Double.isInfinite(a) || Double.isInfinite(b)) {
            return false;
        }
        if (a >= (b - tolerance) && a <= (b + tolerance)) {
            return true;
        }
        return false;
    }
}

Related Tutorials