Quiz

Question 1

What is the printed output of the following code?

fn main() {
 let num: i32 = 5;
 {
  let num: i32 = num * 20;
 }
 println!("{}", num);
}

Question 2

True or false:

String slices are stored on the heap.

Question 3

Will the following code compile?

fn main() {
 let s = String::from("hello");
 print_string(s);
 dbg!(s);
}

fn print_string(s: String) {
 for i in s.chars() {
  println!("{}", i)
 }
}

Question 4

Consider the following code:

fn main() {
 let arr = &['1', '2', '3'];
 println!("{} {} {}", arr[0], arr[1], arr[2])
}

What is the type of arr?

Question 5

Why does the following code refuse to compile?

fn main() {
 let mut string = String::from("String!");
 let (x, y, z) = (&mut string, &mut string, &mut string);
 println!("{x}, {y}, {z}");
}