Check if two double precision numbers are "equal", i.e. - Java java.lang

Java examples for java.lang:Math Geometry

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Description

Check if two double precision numbers are "equal", i.e.

Demo Code

/*/*from w  ww  .  j  a  v a2  s  .c  o m*/
 * (C) 2004 - Geotechnical Software Services
 * 
 * This code 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 code 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 program; if not, write to the Free 
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, 
 * MA  02111-1307, USA.
 */
//package com.java2s;

public class Main {
    /**
     * Check if two double precision numbers are "equal", i.e. close enough
     * to a given limit.
     * 
     * @param a      First number to check
     * @param b      Second number to check   
     * @param limit  The definition of "equal".
     * @return       True if the twho numbers are "equal", false otherwise
     */
    private static boolean equals(double a, double b, double limit) {
        return Math.abs(a - b) < limit;
    }

    /**
     * Check if two double precision numbers are "equal", i.e. close enough
     * to a prespecified limit.
     * 
     * @param a  First number to check
     * @param b  Second number to check   
     * @return   True if the twho numbers are "equal", false otherwise
     */
    private static boolean equals(double a, double b) {
        return equals(a, b, 1.0e-5);
    }
}

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