Finishing up guessing game

rustbook/guessing_game/Cargo.lock

@@ -1,4 +1,20 @@
 [root]
 name = "guessing_game"
 version = "0.1.0"
+dependencies = [
+ "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rand"
+version = "0.3.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 

rustbook/guessing_game/Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 authors = ["Dan Buch <daniel.buch@gmail.com>"]
 
 [dependencies]
+rand = "0.3.0"

rustbook/guessing_game/src/main.rs

@@ -1,14 +1,36 @@
+extern crate rand;
+
 use std::io;
+use std::cmp::Ordering;
+use rand::Rng;
 
 fn main() {
     println!("Guess the number!");
 
-    println!("Please input your guess.");
+    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 mut guess = String::new();
+        let guess: u32 = match guess.trim().parse() {
+            Ok(num) => num,
+            Err(_) => continue,
+        };
 
-    io::stdin().read_line(&mut guess)
-        .expect("Failed to read line");
+        println!("You guessed: {}", guess);
 
-    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;
+            },
+        }
+    }
 }