loop structure.

src/main.rs

@@ -7,21 +7,26 @@ fn main() {
 
     println!("Secret number is {:?}", secret_number);
 
-    println!("Guessing a number:");
+    loop {
+        println!("Guessing a number:");
 
-    let mut guess_number = String::new();
+        let mut guess_number = String::new();
 
-    io::stdin().read_line(&mut guess_number)
-        .expect("Failed to read line.");
+        io::stdin().read_line(&mut guess_number)
+            .expect("Failed to read line.");
 
-    let guess_number: u32 = guess_number.trim().parse()
-        .expect("Not a number.");
+        let guess_number: u32 = guess_number.trim().parse()
+            .expect("Not a number.");
 
-    println!("You guess : {:?}", guess_number);
+        println!("You guess : {:?}", guess_number);
 
-    match guess_number.cmp(&secret_number) {
-        Ordering::Less => println!("Too small."),
-        Ordering::Greater => println!("Too big."),
-        Ordering::Equal => println!("You win!")
+        match guess_number.cmp(&secret_number) {
+            Ordering::Less => println!("Too small."),
+            Ordering::Greater => println!("Too big."),
+            Ordering::Equal => {
+                println!("You win!");
+                break;
+            }
+        }
     }
 }