Variables
Rust provides type safety via static typing. Variable bindings are immutable by default:
fn main() { let x: i32 = 10; println!("x: {x}"); // x = 20; // println!("x: {x}"); }
- Due to type inference the
i32
is optional. We will gradually show the types less and less as the type progresses. - Note that since
println!
is a macro,x
is not moved, even using the function like syntax ofprintln!("x: {}", x)