September Morn Update

Task/Fibonacci-sequence/Rust/fibonacci-sequence-3.rust

@@ -1,14 +1,7 @@
-#![feature(conservative_impl_trait)]
-
-fn main() {
-    for num in fibonacci_gen(10) {
-        println!("{}", num);
+fn fib(n: u32) -> u32 {
+    match n {
+        0 => 0,
+        1 => 1,
+        n => fib(n - 1) + fib(n - 2),
     }
 }
-
-fn fibonacci_gen(terms: i32) -> impl Iterator<Item=u64> {
-    let sqrt_5 = 5.0f64.sqrt();
-    let p  = (1.0 + sqrt_5) / 2.0;
-    let q = 1.0/p;
-    (1..terms).map(move |n| ((p.powi(n) + q.powi(n)) / sqrt_5 + 0.5) as u64)
-}