virutal distructor

class base {   public:     base()         { cout<<"Constructing base \n"; }     ~base()     { cout<<"Destructing base \n"; }     };   class derived: public base {   public:     derived()         { cout<<"Constructing derived \n"; }     ~derived()     { cout<<"Destructing derived \n"; } };   int main(void) {   derived *d = new derived();    base *b = d;   delete b;   getchar();   return 0; }

Although the output of following program may be different on different compilers, when compiled using Dev-CPP, it prints following:

Constructing base
Constructing derived

// If virtual ~base()

 //then call first : "Destructing Dervied"
Destructing base