added lecture 2 live code

Author: joshHug

lec3/live2/IntList.java

@@ -0,0 +1,57 @@
+/** Defines a recursive integer list.
+ *  @author Josh Hug
+ */
+
+public class IntList {
+    public int head;
+    public IntList tail;
+
+    public IntList(int h, IntList t) {
+        head = h;
+        tail = t;
+    }
+
+    /** Returns the number of items in this IntList */
+    public int size() {
+        // if (tail.null == 0) { that was weird
+        if (tail == null) {
+            return 1;
+        }
+        return 1 + tail.size();
+    }
+
+    /** Returns the size, not using recursion. */
+    public int iterativeSize() {
+        IntList p = this;
+        int size = 0;
+        while (p != null) {
+            size = size + 1;
+            p = p.tail;
+        }
+        return size;
+    }
+
+    /** Return ith item of int list */
+    public int get(int i) {
+        if (i == 0) {
+            return head;
+        }
+        return tail.get(i - 1);
+    }
+
+    public String toString() {
+        if (tail == null)
+            return Integer.toString(head);
+        return Integer.toString(head) + " " + tail.toString();
+    }
+
+    public static void main(String[] args) {
+        IntList L = new IntList(10, null);
+        L.tail = new IntList(614, null);
+        /*System.out.println(L.head);
+        System.out.println(L.tail.head);
+        System.out.println(L.size());*/
+        System.out.println(L.iterativeSize());
+        System.out.println(L.get(50));
+    }
+} 

lec3/live2/IntListOps.java

@@ -0,0 +1,24 @@
+/** 
+ *  @author Josh Hug
+ */
+
+public class IntListOps {
+    /** Returns list identical to L, but with
+     * each item incremented by x. Not changing
+     * L in any way */
+    public static IntList incrList(IntList L, int x) {
+        if (L == null)
+            return null;
+        
+        int desiredHead = L.head + x;
+        IntList desiredTail = incrList(L.tail, x); ///the rest of the list incremented by x
+        return new IntList(desiredHead, desiredTail);
+    }
+
+    public static void main(String[] args) {
+        IntList L = new IntList(10, null);
+        L.tail = new IntList(614, null);
+        IntListOps slops = new IntListOps();
+        System.out.println(IntListOps.incrList(L, 5));
+    }
+}