While with mut countdown

rustbook/branches/src/main.rs

@@ -1,10 +1,11 @@
 fn main() {
-    let condition = true;
-    let number = if condition {
-        5
-    } else {
-        6
-    };
+    let mut number = 3;
 
-    println!("The value of number is: {}", number);
+    while number != 0 {
+        println!("{}!", number);
+
+        number = number - 1;
+    }
+
+    println!("LIFTOFF!!!");
 }