Rust Brain Teasers

Puzzle 3

Type Conversion

type_conversion/src/main.rs

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.");
    }
}

Guess the Output
	Try to guess what the output is before moving to the next page.

The program will display the following output:

x does not equal y.

Discussion

Rust’s as keyword is lossy. And when you use it to convert ...