Variables

Rust provides type safety via static typing. Variable bindings are made with let:

1. ```
   fn main() {
   ```
2. ```
       let x: i32 = 10;
   ```
3. ```
       println!("x: {x}");
   ```
4. ```
       // x = 20;
   ```
5. ```
       // println!("x: {x}");
   ```
6. ```
   }
   ```

This slide should take about 5 minutes.

• Uncomment the x = 20 to demonstrate that variables are immutable by default. Add the mut keyword to allow changes.
• The i32 here is the type of the variable. This must be known at compile time, but type inference (covered later) allows the programmer to omit it in many cases.