update

basic_content/virtual/set3/virtual_function1.cpp

@@ -0,0 +1,22 @@
+#include<iostream> 
+using namespace std; 
+
+class Derived; 
+
+class Base { 
+    public: 
+        virtual void fun() { cout << "Base Fun"; } 
+     //   friend int main(); 
+}; 
+
+class Derived: public Base { 
+    private: 
+        void fun() { cout << "Derived Fun"; } 
+}; 
+
+int main() 
+{ 
+    Base *ptr = new Derived; 
+    ptr->fun(); 
+    return 0; 
+}