src/doc/book/listings/ch09-error-handling/listing-09-13/src/main.rs

   1 use rand::Rng;
   2 use std::cmp::Ordering;
   3 use std::io;
   4
   5 // ANCHOR: here
   6 pub struct Guess {
   7     value: i32,
   8 }
   9
  10 impl Guess {
  11     pub fn new(value: i32) -> Guess {
  12         if value < 1 || value > 100 {
  13             panic!("Guess value must be between 1 and 100, got {}.", value);
  14         }
  15
  16         Guess { value }
  17     }
  18
  19     pub fn value(&self) -> i32 {
  20         self.value
  21     }
  22 }
  23 // ANCHOR_END: here
  24
  25 fn main() {
  26     println!("Guess the number!");
  27
  28     let secret_number = rand::thread_rng().gen_range(1..=100);
  29
  30     loop {
  31         println!("Please input your guess.");
  32
  33         let mut guess = String::new();
  34
  35         io::stdin()
  36             .read_line(&mut guess)
  37             .expect("Failed to read line");
  38
  39         let guess: i32 = match guess.trim().parse() {
  40             Ok(num) => num,
  41             Err(_) => continue,
  42         };
  43
  44         let guess = Guess::new(guess);
  45
  46         match guess.value().cmp(&secret_number) {
  47             Ordering::Less => println!("Too small!"),
  48             Ordering::Greater => println!("Too big!"),
  49             Ordering::Equal => {
  50                 println!("You win!");
  51                 break;
  52             }
  53         }
  54     }
  55 }