intended c++ virtual function not getting called -

this code

#include "stdafx.h"**  class iplayback {       public:            virtual void createrenderstream() = 0;  };  class icapture  {       public:           virtual void createcapturestream() = 0;   };  class iaudiostackinterface {    public:       virtual void createstream() = 0;  };  class caudioclientinterface : public iaudiostackinterface,                               public icapture,                               public iplayback  {         void createcapturestream()         {              printf("\n in createcapturestream");         }          void createrenderstream()         {             printf("\n in createrenderstream");         }          void createstream()         {             printf("\n in createstream");         } };   typedef iaudiostackinterface* piaudiostackinterface; typedef icapture* pcapture; typedef iplayback* piplayback; typedef void* pvoid;  int main() {     pvoid pobj = new caudioclientinterface();     piplayback pplaybackinterfcace = (piplayback) pobj;     pplaybackinterfcace->createrenderstream();     return 0; } 

i should createrenderstream printed whereas getting createstream printed?

try

piplayback pplaybackinterfcace = (piplayback)(caudioclientinterface*) pobj; 

you allowed cast void* , original type caudioclientinterface*. casting type undefined behavior.