fix variables

exercises/variables/variables1.rs

@@ -6,9 +6,10 @@
 // even after you already figured it out. If you got everything working and
 // feel ready for the next exercise, remove the `I AM NOT DONE` comment below.
 
-// I AM NOT DONE
+
+use std::u16;
 
 fn main() {
-    x = 5;
+    let x:u16 = 5;
     println!("x has the value {}", x);
 }

exercises/variables/variables2.rs

@@ -1,10 +1,10 @@
 // variables2.rs
 // Make me compile! Execute the command `rustlings hint variables2` if you want a hint :)
 
-// I AM NOT DONE
+use std::u16;
 
 fn main() {
-    let x;
+    let x:u16 = 0;
     if x == 10 {
         println!("Ten!");
     } else {

exercises/variables/variables3.rs

@@ -1,10 +1,9 @@
 // variables3.rs
 // Make me compile! Execute the command `rustlings hint variables3` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    let x = 3;
+    let mut x = 3;
     println!("Number {}", x);
     x = 5;
     println!("Number {}", x);

exercises/variables/variables4.rs

@@ -1,9 +1,8 @@
 // variables4.rs
 // Make me compile! Execute the command `rustlings hint variables4` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    let x: i32;
+    let x: i32 = 0;
     println!("Number {}", x);
 }

exercises/variables/variables5.rs

@@ -1,11 +1,10 @@
 // variables5.rs
 // Make me compile! Execute the command `rustlings hint variables5` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    let number = "3";
+    let mut number = "3";
     println!("Number {}", number);
-    number = 3;
+    number = "3";
     println!("Number {}", number);
 }