Code shared from the Rust Playground

playground.rs

//! Checks if an integer is an odious number.

/// Determine if an integer is an odious number.
///
/// 14 is an odious number because it has an odd number of 1s in its binary
/// expansion 1110. Conversely, 5 isn't an odious number. It has an even number
/// of 1s in its binary expansion 101 and so is called an evil number.
fn is_odious(num: i64) -> bool {
    let mut num = num;
    let mut sum = false;

    while num > 0 {
        sum ^= num & 1 == 1;
        num >>= 1;
    }

    sum
}

fn main() {
    println!("14 -> {}", is_odious(14));
    println!("5  -> {}", is_odious(5));
}