1 files changed, 9 insertions, 0 deletions
diff --git a/rust/rustlings/solutions/01_variables/variables4.rs b/rust/rustlings/solutions/01_variables/variables4.rs
new file mode 100644
index 0000000..7de6bcb
--- /dev/null
+++ b/rust/rustlings/solutions/01_variables/variables4.rs
@@ -0,0 +1,9 @@
+fn main() {
+    // In Rust, variables are immutable by default.
+    // Adding the `mut` keyword after `let` makes the declared variable mutable.
+    let mut x = 3;
+    println!("Number {x}");
+
+    x = 5;
+    println!("Number {x}");
+}