Simple Example of getting an integer from Command line in the Rust

RustUserInputNumber.rs

use std::io;

fn main() {
    // Short version without Error handling. If input is not a valid number, program will
    // exit with error in runtime.
    let mut user_input_string = String::new();
    io::stdin().read_line(&mut user_input_string).unwrap();
    let user_input_number = user_input_string.trim().parse::<i32>().unwrap();   // Trims The input for removing white spaces and then parses it as a `i32` number.
    println!("User number is: {}", user_input_number);

    // Long Version with Error handling.
    user_input_string = String::new();
    io::stdin().read_line(&mut user_input_string).unwrap();
    match user_input_string.trim() .parse::<i32>(){
        Ok(user_number) => println!("User number is: {}", user_number),
        Err(_) => println!("Something is not wrong. Maybe you did not enter a valid integer.")
    }
}