Rust Brain Teasers

Puzzle 11

Stacking Boxes

boxes/src/main.rs

fn main() {
    let c = Box::new([0u32; 10_000_000]);
    println!("{}", c.len());
}

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

In debug mode, the program will crash with the message thread ’main’ has overflowed its stack. In release mode, the program will display the following output: 10000000.

Discussion

10,000,000 32-bit integers requires 40Mb of memory ...