kubo39 https://blog.hatena.ne.jp/kubo39/ kubo39's blog https://kubo39.hatenablog.com/ Rust 無意味にマクロで。 macro_rules! fib { ( $n:expr ) => {{ let (mut x, mut y) = (1, 0); for _ in 0..$n { let tmp = box x; x += y; y = *tmp; } y }}; } fn main() { println!("{}", fib!(10)); } ( ՞ਊ ՞) :~/dev $ rustc --version # ちと古い rustc 1.0.0-nightly (4db0b3246 2015-02-25) (built 2015-02-26) ( ՞ਊ ՞) :~/dev $ rus… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkubo39.hatenablog.com%2Fentry%2F2015%2F03%2F26%2F000448" title="フィボナッチ rust版 - kubo39&#39;s blog" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2015-03-26 00:04:48 rich https://kubo39.hatenablog.com/entry/2015/03/26/000448 1.0 100%