info1 lab2

hugo/content/classes/ws2023/info1/labs/exercise-02.md

@@ -77,7 +77,7 @@ Use the project `chapter02/kara/kara-clock-lab02` for these exercises.
 #### 1. Multi-Move
 
 0. Open the project `chapter02/kara/kara-clock-lab02`. It contains several test worlds. Make sure you've instantiated the correct test world!
-1. copy the multiMove method we discussed in class from `chapter02/kara/kara-loop-examples` to DigitDisplayKara. Test it in TestWorld0 and TestWorld1. TestWorld1 contains a setup you don't need to understand just now - just click "act" once and all Karas should be aligned in the middle like this:
+1. copy the multiMove method we discussed in class from `chapter02/kara/kara-loop-examples` to DigitDisplayKara (the method definition is already there, you just need to fill it). Test it in TestWorld0 and TestWorld1. TestWorld1 contains a setup you don't need to understand just now - just click "act" once and all Karas should be aligned in the middle like this:
 
 | Initial TestWorld1                            | TestWorld1 after act()                      |
 |:----------------------------------------------|:--------------------------------------------|
@@ -93,6 +93,18 @@ you're done test it in TestWorld2:
 
 #### 2. Count Leaves
 
+1. Open TestWorld4. complete the method `public int moveUpAndCount()` in `DigitDisplayKara`.
+   It should move up and count the leaves. It should stop either at the tree above or on the first free field. It returns the number of leaves counted.
+   Test your method by calling it from Kara's context menu. 
+2. When you're done, test your method in TestWorld5, which contains some edge cases like a full row and one with zero leaves.
+
+| TestWorld5 before| TestWorld5 output                           | TestWorld5 after act()                      |
+|:--|:----------------------------------------------|:--------------------------------------------|
+|  ![TestWorld5 before](./testworld5-before.jpg) | ![TestWorld5 output](./testworld5-output.jpg) | ![TestWorld5 after](./testworld5-after.jpg) |
+
+#### 3. Preview
+The next step would be a `public int countLeaves()` method that combines  `public int moveUpAndCount()` and the `public void multiMove(int n)` methods: it counts the leaves and returns back to the home position. But we will do this next week!
+
 ## What to hand in
 
 Hand in your lab report (pdf) and your code (zip) the night before the next lab, 10pm (22.00 Uhr). See [the Labs and Exercises page](../).