Guess the number/With feedback (player): Difference between revisions

=={{header|Rust}}==

{{works with|rustc|0.9-pre}}

<lang rust>use std::io::stdio::stdin;

use std::str;

fn main() {

let mut low = 1;

let mut high = 100;

let mut current_guess = calculate_guess(low, high);

let mut number_of_guesses = 1;

let mut stdin = stdin();

println!("Hello, please choose a number between {} and {} and remember it.", low, high);

println("Got it? Good. Now I shall guess it using only the power of my mind.\n");

loop {

println!("My guess is {:d}. Is that too [h]igh, too [l]ow or is it [e]qual to it? ", current_guess);

println("(please type h, l or e and then hit enter)");

let buf: &mut [u8] = [0u8, ..8];

let num_bytes = stdin.read(buf);

let answer = str::from_utf8_slice(buf).slice_to(num_bytes.unwrap()).trim();

match answer {

"e" | "E" => {

println!("Jolly good! I got it in only {} tries!", number_of_guesses);

break;

}

"l" | "L" => {

low = current_guess;

current_guess = calculate_guess(low, high);

number_of_guesses += 1;

}

"h" | "H" => {

high = current_guess;

current_guess = calculate_guess(low, high);

number_of_guesses += 1;

}

_ => println("sorry, I didn't quite get that")

}

if low == high {

println!("Your number must be {}. Or maybe you forgot it? It happens!", low);

break;

}

if low > high {

println("Uh, I think something went wrong. Entirely my fault, I'm sure!");

break;

}

}

}

fn calculate_guess(low: int, high: int) -> int {

(low + high) / 2

}

</lang>