init add of ch02-00

ch02-00/guessing_game/.gitignore

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+/target

ch02-00/guessing_game/Cargo.toml

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+[package]
+name = "guessing_game"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rand = "0.8.5"

ch02-00/guessing_game/src/main.rs

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+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..=100);
+
+ 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;
+ }
+ }
+ }
+}