added an implemention of stack using queue

stack/stackUsingQueue.cpp

@@ -0,0 +1,50 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+class Stack{
+    queue<int>q;
+    public:
+        void push(int x){
+            int s=q.size();
+            q.push(x);
+            for(int i=0; i<s; i++){
+                q.push(q.front());
+                q.pop();
+            }
+        }
+
+        void pop(){
+             q.pop();
+        }
+        int Top(){
+            return q.front();
+        }
+        int Size()
+        {
+            return q.size();
+        }
+
+        void print()
+        {
+            while(!q.empty()){
+                cout<<q.front()<<endl;
+                q.pop();
+            }
+        }
+
+};
+
+int main()
+{
+    Stack st;
+    st.push(3);
+    st.push(2);
+    st.push(4);
+    st.push(1);
+    // st.pop();
+    cout<<st.Top()<<endl;
+    st.print();
+
+
+    return 0;
+}