finish chapter 6

1 files changed, 40 insertions, 0 deletions

diff --git a/rust/theBook/chapter-6-enums-and-pattern-matching/enum-way/src/main.rs b/rust/theBook/chapter-6-enums-and-pattern-matching/enum-way/src/main.rs
new file mode 100644
index 0000000..f419cc9
--- /dev/null
+++ b/rust/theBook/chapter-6-enums-and-pattern-matching/enum-way/src/main.rs
@@ -0,0 +1,40 @@
+#[derive(Debug)]
+
+enum UpState {
+    Alabama,
+    Alaska,
+}
+
+enum Coin {
+    Penny,
+    Nickel,
+    Dime,
+    Quarter(UpState),
+}
+
+fn main() {
+    let state = UpState::Alaska;
+    let coin = Coin::Quarter(state);
+    println!("the quater is {}",value_in_cents(coin));
+    println!("x = {:?}", plus_one(None));
+}
+
+fn value_in_cents(coin: Coin) -> u8 {
+    match coin {
+        Coin::Penny => 1,
+        Coin::Nickel => 5,
+        Coin::Dime => 10,
+        Coin::Quarter(state) => {
+            println!("state quarter from {:?}",state);
+            25
+        }
+    }
+}
+
+
+fn plus_one(x: Option<i32>) -> Option<i32> {
+    match x {
+        None => None,
+        Some(i) => Some(i+1),
+    }
+}