Create random u8 from 0 to 255 inclusive

Question

I am trying to create a program that generates random numbers from 0 to 255 inclusive. It seems so simple! I have done this:

extern crate rand;
use rand::Rng;

fn main() {
    println!("Guess the number!");
    let random_number: u8 = rand::thread_rng().gen_range(0, 255);

    println!("Your random number is {}", random_number);
}

This works great, but the problem with this approach is that the number 255 will not be included :

The method gen_rangetakes two numbers as arguments and generates a random number between them. It is inclusive on the lower border, but exclusively on the upper border.

When I try to do this:

let random_number: u8 = rand::thread_rng().gen_range(0, 256);

Rust will generate a warning because it u8accepts values ​​from 0 to 255.

warning: literal out of range for u8
 --> src/main.rs:6:61
  |
6 |     let random_number: u8 = rand::thread_rng().gen_range(0, 256);
  |                                                             ^^^
  |
  = note: #[warn(overflowing_literals)] on by default

How can I get around this without changing the type of the variable random_number?

Answer 1

gen. .

extern crate rand;

use rand::Rng;

fn main() {
    println!("Guess the number!");
    let random_number: u8 = rand::thread_rng().gen();

    println!("Your random number is {}", random_number);
}