print the printable portion of ascii character space

main.rs

use std::io::{self, Write};

fn main() {
    write_ascii(std::io::stdout()).unwrap();
}

fn write_ascii<W: Write>(mut w: W) -> Result<(), io::Error> {
    let chars = (0x20 as u8..0x7e + 1 as u8)
        .into_iter()
        .map(|b| char::from(b))
        .collect::<Vec<char>>();
    for c in chars.chunks(16) {
        write!(w, "{}\n", c.iter().collect::<String>())?
    }
    Ok(())
}