Refining Ch02.

projects/guessing_game/src/main.rs

@@ -1,15 +1,29 @@
 use std::io;
+use std::cmp::Ordering;
+use rand::Rng;
 
 fn main() {
-    println! ("请猜这个数！");
+    println! ("请猜数！");
+
+    let secret_number = rand::thread_rng().gen_range(1..=100);
+
+    println! ("秘密数字为：{secret_number}");
 
     println! ("请输入你的猜数。");
 
     let mut guess = String::new();
 
-    let bytes = io::stdin()
+    io::stdin()
         .read_line(&mut guess)
         .expect("读取行失败/failed to read line");
 
-    println! ("你猜的是：{guess}，字节数：{bytes}");
+    let guess: u32 = guess.trim().parse().expect("请输入一个数字！");
+
+    println! ("你猜的是：{guess}");
+
+    match guess.cmp(&secret_number) {
+        Ordering::Less => println! ("太小！"),
+        Ordering::Greater => println! ("太大！"),
+        Ordering::Equal => println! ("你赢了！"),
+    }
 }