Puzzle 3: Type Conversion

Let’s try a type-conversion puzzle in Rust.

We'll cover the following

Guess the output

Before moving on to the explanation, try to guess the output of the following program. Good luck!

fn main() {
  let x : u64 = 4_294_967_296; 
  let y = x as u32;
  if x == y as u64 {
    println!("x equals y."); 
  } else {
    println!("x does not equal y."); }
}

Quiz

Q

What is the output of the code above?

A)
[error] out of range!
B)
x equals y.
C)
x does not equal y.