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Решение задачи №95 от UniLecs (без обработки ошибок)
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| //Для удобства, чтобы мерить площадь в долях пи, а не напрямую | |
| //в квадратных единицах | |
| #[derive(Debug, PartialEq)] | |
| struct PiFractions(f64); | |
| impl ::std::convert::Into<f64> for PiFractions { | |
| fn into(self) -> f64 { | |
| self.0 * ::std::f64::consts::PI | |
| } | |
| } | |
| //Входные данные | |
| enum HoledCircle { | |
| Radiuses(f64, f64), //радиусы внутренних окружностей | |
| Chord(f64), //длина хорды | |
| } | |
| fn holed_circle_area(input: &HoledCircle) -> PiFractions { | |
| use HoledCircle::*; | |
| match input { | |
| Radiuses(r1, r2) => PiFractions(2.0 * r1 * r2), | |
| Chord(t) => PiFractions(t * t / 8.0), | |
| } | |
| } | |
| fn main() { | |
| use HoledCircle::*; | |
| assert_eq!(holed_circle_area(&Radiuses(3.0, 4.0)), PiFractions(24.0)); | |
| assert_eq!(holed_circle_area(&Chord(4.0)), PiFractions(2.0)); | |
| } |
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Playground: http://play.rust-lang.org/?gist=f9b9ebf5f5da78f8f3e94f77b145f385&version=stable&mode=debug