Converting a double from one number system to another

Question

Converting a double from one number system to another

I wrote this code:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int radix = scanner.nextInt();
        String number = scanner.next();
        int radixNew = scanner.nextInt();
        if (radix == radixNew)
            System.out.println(number);
        else if (radix == 1)
            System.out.println(Long.toString((long) Math.ceil(Math.log10(Long.parseLong(number))), radixNew));
        else if (radixNew == 1) {
            for (int i=1; i <= Long.parseLong(number, radix);i++)
                System.out.print(1);
        }
        else
            System.out.println(Long.toString(Long.parseLong(number, radix), radixNew));
    }
}

How can I change it to work with double?(Double.toString and parseDouble only work with one parameter and do not allow you to convert numbers to other number systems)

0

java системы-счисления double

Author: PHPoenX, 2020-04-03

Source

1 answers

score 2 · Answer 1

Double is encoded according to the IEEE 754 standard, which separates the mantissa, order, and sign (64 bits).

There is a method Double.doubleToRawLongBits(double value), which translates the bits of IEEE 754 into bits long, then these bits long can be translated into another number system.