fn classify(n: i32) -> i32 {
    if n < 0 {
        -1
    } else if n == 0 {
        0
    } else {
        1
    }
}

fn main() {
    let mut total: i32 = 0;
    for i in -3..4 {
        total += classify(i);
        println!("{} -> {}", i, classify(i));
    }
    let mut k: i32 = 0;
    while k < 3 {
        k += 1;
    }
    loop {
        k += 1;
        if k > 5 {
            break;
        }
    }
    println!("total={} k={}", total, k);
}