rust scratchpad

number_guess.rs

use std::{io, cmp::Ordering};
use rand::{Rng, thread_rng};

const NUM_GUESSES: i32 = 5;
const MIN: i32 = 0;
const MAX: i32 = 100;


fn main() {
    start_game();
}

fn start_game() {
    let answer = thread_rng().gen_range(MIN..MAX);
    let mut cur_attempt = 0;

    println!("I'm thinking of a number between {} and {}...", MIN, MAX);
    println!("Enter any number to guess, or any other character to end the game.");

    let mut won = false;
    for _i in 0..NUM_GUESSES {
        cur_attempt += 1;

        if let Some(guess) = handle_choice() {
            won = handle_guess(answer, guess);
            if won {
                break;
            }
        }
        else {
            break;
        }
    }

    if won {
        println!("Yep, that's the number. Well done.");
        println!("I call for a do-over!\n\n");
        start_game();
    }
    else if cur_attempt == NUM_GUESSES {
        println!("Out of guesses!\n\n");
    }
    else {
        println!("Welp, you couldn't do it.");
    }
}

fn handle_choice() -> Option<i32> {
    let stdin = io::stdin();
    let mut input = String::new();
    stdin.read_line(&mut input).ok()?;

    let i = input.trim().parse::<i32>().ok()?;
    println!();
    Some(i)
}

fn handle_guess(answer: i32, guess: i32) -> bool {

    match guess.cmp(&answer) {
        Ordering::Equal => return true,
        Ordering::Less => println!("That's too low!"),
        Ordering::Greater => println!("That's too high!")
    }
    
    if answer * answer == guess {
        println!("Well, that's a square anyway.");
    }
    else if answer % guess == 0 {
        println!("Well, that's a factor anyway.");
    }
    else if guess % answer == 0 {
        println!("Well, that's a multiple anyway.");
    }

    false

}