Java Double Number Divide div(double left, double right)

Description

div

License

Open Source License

Declaration

public static long div(double left, double right) 

Method Source Code

//package com.java2s;
/*/*from  ww w  .  j a  va  2 s  .com*/
 * #%~
 * VDM Code Generator Runtime
 * %%
 * Copyright (C) 2008 - 2014 Overture
 * %%
 * This program 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.
 * 
 * This program 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/gpl-3.0.html>.
 * #~%
 */

public class Main {
    public static long div(double left, double right) {
        validateInput(left, right);

        return computeDiv(left, right);
    }

    private static void validateInput(double left, double right) {
        if (!(is_int(left) && is_int(right))) {
            throw new ArithmeticException("Operands must be integers. Got left " + left + " and right" + right);
        }

        if (right == 0L) {
            throw new ArithmeticException("Division by zero is undefined");
        }
    }

    private static long computeDiv(double lv, double rv) {
        if (lv / rv < 0) {
            return (long) -Math.floor(Math.abs(lv / rv));
        } else {
            return (long) Math.floor(Math.abs(-lv / rv));
        }
    }

    public static boolean is_int(Object value) {
        Double doubleValue = getDoubleValue(value);

        return is_int(doubleValue);
    }

    private static boolean is_int(Double doubleValue) {
        return doubleValue != null && (doubleValue == Math.floor(doubleValue)) && !Double.isInfinite(doubleValue);
    }

    private static Double getDoubleValue(Object value) {
        if (!(value instanceof Number)) {
            return null;
        }

        Double doubleValue = ((Number) value).doubleValue();

        return doubleValue;
    }
}

Related

1. div(double a, double b)
2. div(double a, double b)
3. div(double a, double b)
4. div(Double dividend, Double quotient)
5. div(double divisor, int dividend, int preciseFigures)
6. div(final double a, final double b)
7. divdivmin(double a, double b, double c, double d)
8. divergenceKL(double... a)
9. divHex(double num)