Code shared from the Rust Playground

playground.rs

use std::io;

fn main() {
    loop {
        println!("Please input your guess.");
        let mut input = String::new();
        io::stdin().read_line(&mut input).expect("Failed to read line");
        let input = input.trim();
        let guess: u32 = match input.parse() {
            Ok(num) => num,
            Err(_) => {
                if input == "exit" {
                    println!("bye");
                    break;
                } else {
                    println!("Enter a number, please.");
                    continue;
                }
            }
        };
        println!("guess = {}", guess);
    }
}