init

problems/p2/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "p2"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

problems/p2/src/main.rs

@@ -0,0 +1,48 @@
+struct Fib {
+    current: u32,
+    next: u32,
+}
+
+impl Fib {
+    fn new() -> Fib {
+        Fib {
+            current: 1,
+            next: 2,
+        }
+    }
+}
+
+impl Iterator for Fib {
+    type Item = u32;
+    fn next(&mut self) -> Option<Self::Item> {
+        let current = self.current;
+        self.current = self.next;
+        self.next += current;
+        Some(current)
+    }
+}
+
+fn fib_sum() -> u32 {
+    let mut sum: u32 = 0;
+    let mut fib = Fib::new();
+
+    let mut number = fib.next().unwrap();
+    while number < 4000000 {
+        if number % 2 == 0 {
+            sum += number;
+        }
+
+        number = fib.next().unwrap();
+    }
+
+    sum
+}
+
+fn main() {
+    let mut fib = Fib::new();
+
+    for _ in 0..10 {
+        print!("{} ", fib.next().unwrap());
+    }
+    println!("{}", fib_sum());
+}