What will happen when I call a member function on a NULL object pointer?

Question

I was given the following as an interview question:

class A
{
public:
    void fun()
    {
        std::cout << "fun" << std::endl;
             


        

Answer 1

I have tried multiple times,all the time output is coming "fun" this is because function fun is independent of instance a. while calling a->fun(); a points to 0 so this is undefined behavior but in most of the compilers there should be no crash.