Question

How to convert a number to any base in Rust

Answer 1

use std::error::Error;

fn to_base(mut n: u32, base: u32) -> Result<String, Box<dyn Error>> {
    const DIGITS: &str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    if base < 2 || base > 36 {
        return Err("Base must be between 2 and 36".into());
    }

    if n == 0 {
        return Ok("0".to_string());
    }

    let mut result = String::new();

    while n > 0 {
        let remainder = (n % base) as usize;
        result.push(DIGITS.chars().nth(remainder).unwrap());
        n /= base;
    }

    let reversed: String = result.chars().rev().collect();
    Ok(reversed)
}

fn main() -> Result<(), Box<dyn Error>> {
    let number = 255;

    for &base in &[2, 8, 16, 36] {
        let converted = to_base(number, base)?;
        println!("{} in base {} = {}", number, base, converted);
    }

    Ok(())
}

 
  
   
/*
run:
   
255 in base 2 = 11111111
255 in base 8 = 377
255 in base 16 = FF
255 in base 36 = 73
  
*/

 

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