Merge pull request #2 from tobyatgithub/chap2.0

Finished a guessing game.

projects/guessing_game/Cargo.lock

@@ -0,0 +1,85 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "guessing_game"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
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+name = "libc"
+version = "0.2.101"
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+ "libc",
+ "rand_chacha",
+ "rand_core",
+ "rand_hc",
+]
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+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
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+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "rand_hc"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "rand_core",
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projects/guessing_game/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "guessing_game"
+version = "0.1.0"
+authors = ["Toby <toby.fangyuan@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.3"

projects/guessing_game/src/main.rs

@@ -0,0 +1,34 @@
+use rand::Rng;
+use std::cmp::Ordering;
+use std::io;
+
+fn main() {
+    println!("Guess the number!");
+
+    loop {
+        println!("Please input your guess.");
+
+        let secret_number = rand::thread_rng().gen_range(1..101);
+        println!("The secret number is: {}", secret_number);
+        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;
+            }
+        }
+    }
+}