September 2017 Update

Task/Monty-Hall-problem/Rust/monty-hall-problem.rust

@@ -0,0 +1,26 @@
+extern crate rand;
+use rand::Rng;
+
+#[derive(Clone, Copy, PartialEq)]
+enum Prize {Goat , Car}
+
+const GAMES: usize = 3_000_000;
+fn main() {
+    let mut switch_wins = 0;
+    let mut rng = rand::thread_rng();
+
+    for _ in 0..GAMES {
+        let mut doors = [Prize::Goat; 3];
+        *rng.choose_mut(&mut doors).unwrap() = Prize::Car;
+
+        // You only lose by switching if you pick the car the first time
+        if rng.choose(&doors).unwrap() != &Prize::Car {
+            switch_wins += 1;
+        }
+    }
+    println!("I played the game {total} times and won {wins} times ({percent}%).",
+             total   = GAMES,
+             wins    = switch_wins,
+             percent = switch_wins as f64 / GAMES as f64 * 100.0
+    );
+}