数当てゲームの完成形 #4

Chapter2/gussing_game/src/main.rs

@@ -1,30 +1,37 @@
 extern crate rand;
 
-use std::io;
-use std::cmp::Ordering;
 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);
-    println!("The secret number is: {}", secret_number);
 
-    println!("Please input your guess.");
+    loop {
+        println!("Please input your guess.");
 
-    let mut guess = String::new();
+        let mut guess = String::new();
 
-    io::stdin()
-        .read_line(&mut guess)
-        .expect("failed to read line");
+        io::stdin()
+            .read_line(&mut guess)
+            .expect("failed to read line");
 
-    let guess:i32 = guess.trim().parse().expect("Please type a number!");
+        let guess: i32 = match guess.trim().parse() {
+            Ok(num) => num,
+            Err(_) => continue,
+        };
 
-    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!")
+        match guess.cmp(&secret_number) {
+            Ordering::Less => println!("Too small!"),
+            Ordering::Greater => println!("Too Big!"),
+            Ordering::Equal => {
+                println!("You Win!");
+                break;
+            }
+        }
     }
 }