Merge pull request #4 from ZhiHanZ/exercise_ans

enum, test, test3

exercises/enums/enums1.rs

@@ -1,11 +1,13 @@
 // enums1.rs
 // Make me compile! Execute `rustlings hint enums1` for hints!
 
-// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
-    // TODO: define a few types of messages as used below
+    Quit,
+    Echo,
+    Move,
+    ChangeColor,
 }
 
 fn main() {

exercises/enums/enums2.rs

@@ -1,11 +1,13 @@
 // enums2.rs
 // Make me compile! Execute `rustlings hint enums2` for hints!
 
-// I AM NOT DONE
 
 #[derive(Debug)]
 enum Message {
-    // TODO: define the different variants used below
+    Quit,
+    Echo(String),// a tuple with one elem
+    Move{x: i32, y: i32},
+    ChangeColor(u8, u8, u8),
 }
 
 impl Message {

exercises/enums/enums3.rs

@@ -1,10 +1,13 @@
 // enums3.rs
 // Address all the TODOs to make the tests pass!
 
-// I AM NOT DONE
 
+#[derive(Debug)]
 enum Message {
-    // TODO: implement the message variant types based on their usage below
+    Quit,
+    Echo(String),// a tuple with one elem
+    Move{x: u8, y: u8},
+    ChangeColor(u8, u8, u8),
 }
 
 struct Point {
@@ -37,6 +40,12 @@ impl State {
 
     fn process(&mut self, message: Message) {
         // TODO: create a match expression to process the different message variants
+        match message {
+            Message::Quit => {self.quit()}
+            Message::Move{x, y} => {self.move_position(Point{x: x, y : y})}
+            Message::Echo(string) => {self.echo(string)}
+            Message::ChangeColor(r,g,b) => {self.change_color((r,g,b))}
+        }
     }
 }
 

exercises/test3.rs

@@ -7,7 +7,6 @@
 // we expect to get when we call `times_two` with a negative number.
 // No hints, you can do this :)
 
-// I AM NOT DONE
 
 pub fn times_two(num: i32) -> i32 {
     num * 2
@@ -19,11 +18,11 @@ mod tests {
 
     #[test]
     fn returns_twice_of_positive_numbers() {
-        assert_eq!(times_two(4), ???);
+        assert_eq!(times_two(4), 8);
     }
 
     #[test]
     fn returns_twice_of_negative_numbers() {
-        // TODO write an assert for `times_two(-4)`
+        assert_eq!(times_two(-4), -8);
     }
 }

exercises/tests/tests1.rs

@@ -6,12 +6,11 @@
 // This test has a problem with it -- make the test compile! Make the test
 // pass! Make the test fail! Execute `rustlings hint tests1` for hints :)
 
-// I AM NOT DONE
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert() {
-        assert!();
+        assert!(!(1==9));
     }
 }

exercises/tests/tests2.rs

@@ -2,12 +2,11 @@
 // This test has a problem with it -- make the test compile! Make the test
 // pass! Make the test fail! Execute `rustlings hint tests2` for hints :)
 
-// I AM NOT DONE
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert_eq() {
-        assert_eq!();
+        assert_eq!(1,1);
     }
 }

exercises/tests/tests3.rs

@@ -4,7 +4,6 @@
 // we expect to get when we call `is_even(5)`.
 // Execute `rustlings hint tests3` for hints :)
 
-// I AM NOT DONE
 
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
@@ -16,6 +15,14 @@ mod tests {
 
     #[test]
     fn is_true_when_even() {
-        assert!();
+        assert!(!is_even(5));
+    }
+    #[test]
+    fn is_even_works() ->Result<(), String> {
+        if !is_even(1<<10) {
+            Err(String::from("1<<10"))
+        } else {
+            Ok(())
+        }
     }
 }