fibbo.rs

fn fibbo(max: int, cb: fn(int) -> bool) {
    let mut a = 1;
    let mut b = 0;
    let mut c;

    loop {
        c = a;
        a = a+b;
        b = c;
        if a > max {
            break;
        }
        cb(a);
    }
}

fn do_euler_02(max: int) -> int {
    let mut result = 0;
    for fibbo(max) | i | {
        if i % 2 == 0 {
            result += i;
        }
    }
    return result;
}

fn main() {
    let result = do_euler_02(4000000);
    io::println(fmt!("%d", result));
}