Add a simple class stack, and example

data_structure/stk/stack.h

@@ -0,0 +1,35 @@
+/* This class specifies the basic operation on a stack as a linked list */
+#ifndef STACK_H
+#define STACK_H
+
+/* Definition of the node */
+template <class Type>
+struct node
+{
+    Type data;
+    node<Type> *next;
+};
+
+/* Definition of the stack class */
+template <class Type>
+class stack
+{
+    public:
+        void display();        /* Show stack */
+        stack();               /* Default constructor*/
+        ~stack();              /* Destructor */
+        bool isEmptyStack();   /* Determine whether the stack is empty */
+        void push (Type item); /* Add new item to the stack */
+        Type top();            /* Return the top element of the stack */
+        void pop();            /* Remove the top element of the stack */
+        void clear();
+
+        stack<Type> operator=(stack<Type> & otherStack);
+        // Overload "=" the assignment operator.
+    private:
+        node<Type> *stackTop;  /* Pointer to the stack */
+        int size;
+};
+
+#endif
+