Reads a float from STDIN, parses it, and then displays it on STDOUT

read_float.rs

use std::f32;
use std::io::prelude::*;

fn main() {
    print!("I need a float: ");
    std::io::stdout().flush().ok().expect("Could not flush stdout");

    let stdin = std::io::stdin();
    let mut buf = String::new();

    let num_bytes = stdin.read_line(&mut buf)
        .expect("reading from stdin shouldn't fail");

    println!("Read {} bytes from STDIN", num_bytes);

    let my_float_result = buf.trim().parse::<f32>();
    
    match my_float_result {
        Ok(result) => println!("Your float is {}", result),
        Err(error) => println!("WTF is wrong with you?\n{}", error),
    }

}