Added Reverse_Queue.cpp (#120)

* Added Reverse_Queue.cpp

* Update stack.hpp

Data Structures/C:C++/Stack/Reverse_Queue.cpp

@@ -0,0 +1,48 @@
+/*
+An effective CPP program to reverse a Queue.In this program,
+a Queue is populated with values and then it is reversed using the use of Stack.
+Time Complexity:O(n)
+Space Complexity:Extra Space for Stack
+#include <bits/stdc++.h>
+*/
+using namespace std; 
+void Print(queue<int>& Queue)
+{
+    while (!Queue.empty()) {
+        cout << Queue.front() << " ";
+        Queue.pop();
+    }
+}
+
+// Function to reverse the queue
+void reverseQueue(queue<int>& Queue)
+{
+    stack<int> Stack;
+    while (!Queue.empty()) {
+        Stack.push(Queue.front());
+        Queue.pop();
+    }
+    while (!Stack.empty()) {
+        Queue.push(Stack.top());
+        Stack.pop();
+    }
+}
+
+// Main Function
+int main()
+{
+    queue<int> Queue;
+    Queue.push(1);
+    Queue.push(2);
+    Queue.push(3);
+    Queue.push(4);
+    Queue.push(5);
+    Queue.push(6);
+    Queue.push(7);
+    Queue.push(8);
+    Queue.push(9);
+    Queue.push(10);
+
+    reverseQueue(Queue);
+    Print(Queue);
+}

Data Structures/C:C++/Stack/stack.hpp

@@ -18,7 +18,7 @@ struct stackmp{
 		ll_node<T> *new_node = create_node(new_data);
 		ll_node<T> *temp_node = this->top;
 		new_node->next = temp_node;
-		this->top = new_node;
+		this->top = new_node; // here "this" pointer is used to access the current class's object's parameters
 		size++;
 	}