猜字謎的游戲 （全書第一個(gè)代碼實(shí)例）
use rand::Rng;
use std::cmp::Ordering;
use std::io;
fn main() {
println!("Guess the number!");
let secret_number = rand::thread_rng().gen_range(1..101);
loop {
println!("Please input your guess.");
let mut guess = String::new();
io::stdin()
.read_line(&mut guess)
.expect("Failed to read line");
let guess: u32 = match guess.trim().parse() {
Ok(num) => num,
Err(_) => continue,
};
println!("You guessed: {}", guess);
match guess.cmp(&secret_number) {
Ordering::Less => println!("Too small!"),
Ordering::Greater => println!("Too big!"),
Ordering::Equal => {
println!("You win!");
break;
}
}
}
}
- 如何從控制臺(tái)讀取輸入
- expect（）對(duì)異常的處理
- rand 隨機(jī)數(shù)生成
- match模式匹配
- continue迅腔，break
- loop的使用
