add solution of lab 5

labs/list_implementation/checkpoint2.cpp

@@ -21,6 +21,36 @@ public:
 	NodeB* prev;
 };
 
+template <typename NodeType>
+void PushBack(NodeType*& head, NodeType* newNode) {
+    // If the list is empty, newNode becomes the head
+    if (!head) {
+        head = newNode;
+    } else {
+        // Otherwise, find the tail and attach there
+        NodeType* current = head;
+        while (current->next != nullptr) {
+            current = current->next;
+        }
+        current->next = newNode;
+        newNode->prev = current;
+    }
+}
+
+template <typename NodeType>
+void PrintList(NodeType* head) {
+    NodeType* current = head;
+    while (current != nullptr) {
+        // For doubles, you might do: std::cout << std::fixed << std::setprecision(5);
+        std::cout << current->data;
+        if (current->next != nullptr) {
+            std::cout << " -> ";
+        }
+        current = current->next;
+    }
+    std::cout << " -> nullptr" << std::endl;
+}
+
 int main() {
 	// Part 1: test NodeA class.
 	// Initialize an empty linked list, consisting of NodeA nodes.