Calling class method through NULL class pointer [duplicate]

Question

I have following code snippet:

class ABC{ public:         int a;         void print(){cout<<"hello"<<endl;} };  int main(){         ABC *ptr = NULL:         ptr->print();         return 0; } 

It runs successfully. Can someone explain it?

Answer 1

Calling member functions using a pointer that does not point to a valid object results in undefined behavior. Anything could happen. It could run; it could crash.

In this case, it appears to work because the this pointer, which does not point to a valid object, is not used in print.