In Java how do you convert a decimal number to base 36?

Question

If I have a decimal number, how do I convert it to base 36 in Java?

Answer 1

I got this code from this website in JavaScript, and this is my version in java:

public static String customBase (int N, String base) {

    int radix = base.length();

    String returns = "";

    int Q = (int) Math.floor(Math.abs(N));
    int R = 0;

    while (Q != 0) {

        R = Q % radix;
        returns = base.charAt(R) + returns;
        Q /= radix; 

    }

    if(N == 0) {
        return String.valueOf(base.toCharArray()[0]);
    }

    return  N < 0 ? "-" + returns : returns;

}

This supports negative numbers and custom bases.

Decimal Addon:

public static String customBase (double N, String base) {

    String num = (String.valueOf(N));
    String[] split = num.split("\\.");
    if(split[0] == "" || split[1] == "") {
        return "";
    }
    return customBase(Integer.parseInt(split[0]), base)+ "." + customBase(Integer.parseInt(split[1]), base);

}