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-rwxr-xr-xrust-book/enums/src/main1.rs48
1 files changed, 48 insertions, 0 deletions
diff --git a/rust-book/enums/src/main1.rs b/rust-book/enums/src/main1.rs
new file mode 100755
index 0000000..9670693
--- /dev/null
+++ b/rust-book/enums/src/main1.rs
@@ -0,0 +1,48 @@
+#[derive(Debug)]
+enum UsState {
+ NY,
+ VA,
+ NC,
+}
+
+enum Coin {
+ Penny,
+ Nickel,
+ Dime,
+ Quarter(UsState),
+}
+
+impl Coin {
+
+ fn value_in_cents(self) -> u32 {
+
+ match self {
+ Coin::Penny => {
+ println!("lucky 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),
+ }
+}
+
+fn main() {
+ let five = Some(5);
+ let six = plus_one(five);
+ let none = plus_one(None);
+}