View difference between Paste ID: 8a7XsNua and 14L6Vph8

 #include <iostream>
 
 using namespace std;
 
 struct Node {
   char data;
   Node* next;
 };
 
 class Stack {
   public:
     Node* head;
     int size;
     void add(char value);
     void output();
     Stack();
     ~Stack();
 };
 
 int main() {
   Stack stack1;
   stack1.add('h');
   stack1.add('e');
   stack1.add('l');
   stack1.add('l');
   stack1.add('o');
   stack1.output();
 
   return 0;
 }
 
 Stack::Stack()
-  :size(0) {}
+  :size(0), head(NULL) {}
 
 Stack::~Stack() {
   Node* cursor = head;
   while (cursor != NULL) {
     Node* next = cursor->next;
-  while (cursor != NULL)
+
-  {
+
-    next = cursor->next;
+
   }
 }
 
 void Stack::add(char value) {
   Node* node = new Node;
   node->data = value;
   node->next = (size == 0) ? NULL : head;
-  if (size == 0) {
+  head = node;
-    head = new Node;
+
-    head->data = value;
+
-    head->next = NULL;
+
-  } else {
+void Stack::output() {
-    Node* ptr = new Node;
+
-    ptr->data = value;
+  if (cursor) {
-    ptr->next = head;
+    while (cursor->next) {
-    head = ptr;
+      cout << cursor->data << endl;
       cursor = cursor->next;
     }
     cout << cursor->data << endl;
   }
-void Stack::output()
+