Merge pull request #507 from roneya/master

Smart Pointer Exercises for Box

en/src/smart-pointers/box.md

@@ -1 +1,52 @@
 # Box
+
+1. 🌟
+```rust,editable
+// Make it work
+fn main() {
+    // Create a new box `b` that contains the integer 5
+    assert_eq!(*b, 5);
+
+    println!("Success!");
+}
+```
+
+2. 🌟
+```rust,editable
+
+// Make it work
+fn main() {
+    let b = Box::new("Hello");
+    print_boxed_string(b);
+}
+
+fn print_boxed_string(b : _) {
+    println!("{}", b);
+}
+```
+
+3. 🌟
+```rust,editable
+
+// Make it work
+fn main() {
+    let b1 = Box::new(5);
+    let b2 = b1;
+    assert_eq!(_, 5);
+
+    println!("Success!");
+}
+```
+
+4. 🌟
+```rust,editable
+
+// Make it work
+fn main() {
+    // Create a box `b` with an array [1, 2, 3, 4, 5]
+    // Print each integer in `b`
+}
+```
+
+
+> You can find the solutions [here](https://github.com/sunface/rust-by-practice)(under the solutions path), but only use it when you need it