loop structure.

src/main.rs

@@ -7,6 +7,7 @@ fn main() {
 
     println!("Secret number is {:?}", secret_number);
 
+    loop {
         println!("Guessing a number:");
 
         let mut guess_number = String::new();
@@ -22,6 +23,10 @@ fn main() {
         match guess_number.cmp(&secret_number) {
             Ordering::Less => println!("Too small."),
             Ordering::Greater => println!("Too big."),
-        Ordering::Equal => println!("You win!")
+            Ordering::Equal => {
+                println!("You win!");
+                break;
+            }
+        }
     }
 }