A guessing game in Rust.

number_game.rs

use io::{Reader,ReaderUtil};
use core::rand::{Rng};
use core::int::abs;

fn generate_secret_number() -> int {
  abs(Rng().gen_int() % 100) + 1
}

fn process_guess(secret:int, guess: int, guesses: &mut int) {
  io::println(fmt!("You guessed: %d", guess));

  if guess > secret {
    io::println("Your guess was too high!");
  }
  else if guess < secret {
    io::println("Your guess was too low!");
  }
  else if guess == secret {
    io::println("You got it!");
    *guesses = 4; // this will end up ending the game.
  }

  *guesses += 1;
}

fn main() {
  let secret = generate_secret_number();
  
  let guesses = @mut 1;

  io::println("--- N U M B E R - G A M E ---");
  io::println("");
  io::println("Guess a number from 1-100 (you get five tries):");

  loop {
    io::println(fmt!("Guess #%d", *guesses));

    let in = io::stdin().read_line();

    match int::from_str(in) {
      Some(number) => process_guess(secret, number, guesses),
      None         => io::println("Hey, put in a number.")
    }
    if *guesses == 5 { break; }
  }

  io::println("Done!");
}