src/doc/book/listings/ch02-guessing-game-tutorial/listing-02-05/src/main.rs

   1 use rand::Rng;
   2 use std::cmp::Ordering;
   3 use std::io;
   4
   5 fn main() {
   6     println!("Guess the number!");
   7
   8     let secret_number = rand::thread_rng().gen_range(1..101);
   9
  10     println!("The secret number is: {}", secret_number);
  11
  12     loop {
  13         println!("Please input your guess.");
  14
  15         let mut guess = String::new();
  16
  17         // ANCHOR: here
  18         // --snip--
  19
  20         io::stdin()
  21             .read_line(&mut guess)
  22             .expect("Failed to read line");
  23
  24         // ANCHOR: ch19
  25         let guess: u32 = match guess.trim().parse() {
  26             Ok(num) => num,
  27             Err(_) => continue,
  28         };
  29         // ANCHOR_END: ch19
  30
  31         println!("You guessed: {}", guess);
  32
  33         // --snip--
  34         // ANCHOR_END: here
  35
  36         match guess.cmp(&secret_number) {
  37             Ordering::Less => println!("Too small!"),
  38             Ordering::Greater => println!("Too big!"),
  39             Ordering::Equal => {
  40                 println!("You win!");
  41                 break;
  42             }
  43         }
  44     }
  45 }