src/doc/book/listings/ch09-error-handling/no-listing-09-guess-out-of-range/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     // ANCHOR: here
  11     loop {
  12         // --snip--
  13
  14         // ANCHOR_END: here
  15         println!("Please input your guess.");
  16
  17         let mut guess = String::new();
  18
  19         io::stdin()
  20             .read_line(&mut guess)
  21             .expect("Failed to read line");
  22
  23         // ANCHOR: here
  24         let guess: i32 = match guess.trim().parse() {
  25             Ok(num) => num,
  26             Err(_) => continue,
  27         };
  28
  29         if guess < 1 || guess > 100 {
  30             println!("The secret number will be between 1 and 100.");
  31             continue;
  32         }
  33
  34         match guess.cmp(&secret_number) {
  35             // --snip--
  36             // ANCHOR_END: here
  37             Ordering::Less => println!("Too small!"),
  38             Ordering::Greater => println!("Too big!"),
  39             Ordering::Equal => {
  40                 println!("You win!");
  41                 break;
  42             }
  43         }
  44         // ANCHOR: here
  45     }
  46     // ANCHOR_END: here
  47 }