Question

I would like to play around with numbers and however elementary, Ive been writing algorithms for the fibonacci sequence and a brute force path for finding prime numbers!

Im not a programmer, just a math guy.

However, a problem I run into quiet often is that a long long, double and floats often run out of room.

If I wanted to continue to work in JAVA, in what way can I create my own data type so that I dont run out of room.

Conceptually, I thought to put 3 doubles together like so,

public class run {

    static double a = 0;
    static double b = 0;
    //static double c = 0;

    static void bignumber(boolean x) {

        if (x == true && a < 999999999) {
            ++a;

        } else if (x == true && a == 999999999) {
            ++b;
            a = 0;
        }
        System.out.print(b + "." + a + " \n");
    }

    public static void main(String[] args) {
        while(true) {
        bignumber(true);

        }
    }

}

is there a better way to do this,

I would like to one day be able to say

mydataType X = 18476997032117414743068356202001644030185493386634
10171471785774910651696711161249859337684305435744
58561606154457179405222971773252466096064694607124
96237204420222697567566873784275623895087646784409
33285157496578843415088475528298186726451339863364
93190808467199043187438128336350279547028265329780
29349161558118810498449083195450098483937752272570
52578591944993870073695755688436933812779613089230
39256969525326162082367649031603655137144791393234
7169566988069

or any other number found on this site

I have also tried

package main;

import java.math.BigInteger;

public class run {
    BigDecimal a = 184769970321174147430683562020019566988069;
    public static void main(String[] args) {

    }

}

But it still seems to be out of range

Answer 1

Use BigDecimal (instead of double), and BigInteger (instead of int, long) for that purpose, But you can only work with them by their methods. No operators, can be used.

Used like this:

BigInteger big = new BigInteger("4019832895734985478385764387592") // Strings...
big.add(new BigInteger("452872468924972568924762458767527");

Same with BigDecimal