Added Stack implementation as header file

Stack.h

@@ -0,0 +1,103 @@
+#ifndef STACK_H
+#define STACK_H
+
+#include<iostream>
+using namespace std;
+
+template <typename T>
+struct Node{
+    T data;
+    Node* next;
+    Node(const T &d, Node*t):data{d},next{t}{}
+};
+
+template <typename T>
+class Stack{
+    public:
+        Stack():top{nullptr},count{0}{
+            // cout << "Stack initialised\n";
+        }
+
+        ~Stack(){
+            if(top){
+                Node<T>*temp = top;
+                int count{0};
+                while(temp){
+                    top = temp->next;
+                    count++;
+                    delete temp;
+                    temp = top;
+                }
+                // cout << "Stack deleted::Elements deleted : " << count << endl;
+            }else{
+                // cout << "Stack empty\n";
+            }
+        }
+
+        void push(const T& val){
+            Node<T>* temp;
+
+            temp = new Node<T>(val,top);
+            top = temp;
+            count++;
+
+        }
+
+        Node<T>* getMiddle(){
+            Node<T>* slow = top;
+            Node<T>* fast = top;
+
+            while(fast && fast->next){
+                slow = slow->next;
+                fast = fast->next->next;
+            }
+
+            return slow;
+        }
+
+        T getTop () const{
+            if(top)
+                return top->data;
+            else 
+                return 0;
+        }
+
+        const T pop(){
+            if(top){
+                Node<T>* temp = top;
+                T data = temp->data;
+                top = top -> next;
+                delete temp;
+                count--;
+                return data;
+            }else
+            {
+                cout << "Stack empty!!\n";
+            }
+
+        }
+
+        bool isEmpty() const{
+            return top?false:true;
+        }
+
+        size_t length() const{
+            return count;
+        }
+
+        void print() const{
+            Node<T>* temp = top;
+            cout << "\n********Stack********\n";
+            while(temp){
+                cout << "\t" << temp->data << '\n';
+                temp = temp->next;
+            }
+            cout << "********---********\n";
+        }
+
+    private:
+        Node<T> * top;
+        size_t count;
+};
+
+#endif