Represent u128 to the string

u128_to_string.rs

const ALPHABET: [char; 16] =
    ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];

// Do not use in production:
// - does not check base 0
// - u128 instead of generic
// - no negative support
fn to_s(num: u128, base: u128) -> String {
    let mut buffer: String = String::new();
    let mut div = num;
    let mut rem = 0;

    loop {
        (div, rem) = (div / base, div % base);
        buffer.push(ALPHABET[rem as usize]);
        if div == 0 { break; }
    }

    buffer.chars().rev().collect()
}

fn main() {
    let s = to_s(255, 16);
    println!("{:?}", s);
}