generealized to superclass set

Assignment_2/Set.cpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Node.cpp"
+
+class Set {
+    protected:
+        Set();
+        Node* first;
+    public:
+        virtual bool add(int element);
+        virtual bool rmv(int element);
+        virtual bool ctn(int element);
+};
+
+Set::Set(){
+    first = Node::Dummy(); // dummy node;
+    Node* last = Node::Dummy();
+    first->next = last;
+}