Array challenges

Author: bowbahdoe

src/arrays/challenges.md

@@ -6,3 +6,79 @@ Remember the rules for this are
 - Try not to give up until you've given it a solid attempt
 
 ## Challenge 1
+
+Edit the following program so that the output is zero.
+
+```java
+void main() {
+    // Only change this line
+    String[] words = { "Sam", "I", "Am" };
+    System.out.println(array.length);
+}
+```
+
+## Challenge 2
+
+Using only `System.out.println` and array accesses,
+print `hello world` to the screen.
+
+```java
+void main() {
+    char[] letters = {
+        ' ',
+        'h',
+        'e',
+        'l',
+        'o',
+        'w',
+        'r',
+        'd'
+    };
+
+    // Your code here
+}
+```
+
+## Challenge 3
+
+Without editing either the array declaration or the loop at the bottom,
+make the output of this program `0`.
+
+```java
+void main() {
+    final int numbers = { 1, 2, 3, 4 };
+
+    // -----------
+    // YOUR CODE HERE
+
+
+    // -----------
+    int total = 0;
+    int index = 0;
+    while (index < numbers.length) {
+        total += numbers[index];
+        index += 1;
+    }
+    System.out.println(total);
+}
+```
+
+## Challenge 4
+
+Make this program output `bulbasaur` without changing anything
+above or below the marked areas.
+
+```java
+void main() {
+    char[] name = { 'b', 'u', 'l', 'b' };
+
+    // -----------
+    // YOUR CODE HERE
+
+
+    // -----------
+    char[] toPrint = name;
+    System.out.println(toPrint);
+}
+```
+