main.rs

use rand::Rng;
use std::cmp::Ordering;
use std::io::Write; //used for the random number generation

fn get_input(prompt: &str) -> String {
    let mut input = String::new();
    print!("{}: ", prompt);
    std::io::stdout()
        .flush()
        .expect("could not flush output buffer"); // flush the output to make sure the line is seen
    std::io::stdin()
        .read_line(&mut input)
        .expect("Could not read input");
    input
}

fn get_guess() -> i32 {
    let guess: String = get_input("Guess a number");
    guess
        .trim()
        .parse()
        .expect("Could not derive a number from guess")
}

fn compare_guess(guess: i32, actual: i32) -> bool {
    let mut guessed_correctly = false;

    // compare the user's guess to the secret number
    match guess.cmp(&actual) {
        Ordering::Less => {
            println!("Your guess was too small")
        }
        Ordering::Equal => {
            println!("You got it right!");
            guessed_correctly = true;
        }
        Ordering::Greater => {
            println!("Your guess was too big")
        }
    };
    guessed_correctly // a boolean on if the guess was right or not
}

fn main() {
    const MIN: i32 = 1;
    const MAX: i32 = 100;
    println!("Can you guess the secret Number??? ({}-{})", MIN, MAX);

    let secret_number: i32 = rand::thread_rng().gen_range(MIN, MAX); // randomly create a secret number
    let mut user_guess = secret_number + 1; //intentionally mismatch the secret number from the guess
    let mut num_guesses = 0; //count how many guesses the user has made

    while user_guess != secret_number {
        user_guess = get_guess(); // Get the guess from the user
        compare_guess(user_guess, secret_number);
        num_guesses += 1;
    }

    println!("You won the game after {} guesses", num_guesses);
}