3nplus1.rs

fn main() {
    let mut i: u64 = 0;
    let mut v: u64;
    let mut highest = u64::MIN;
    loop {
        i += 1;
        v = i;
        loop {
            // Is even
            if v % 2 == 0 {
                v /= 2;
            } else {
                v = 3 * v + 1; 
            }

            if v > highest {
                highest = v;
            }

            if v == 1 {
                if i % 1_000_000 == 0 {
                    println!("{:10}: All Pass | HI {:10}", i, highest);
                }
                break;
            }
        }
    }
}