how a derived class pointer can call the base class function

Question

I have a base class 'a' which includes some virtual function , in the derived class 'b' i overload that function . Now I have one more class 'c' derived from 'b' only and I have a pointer to class c .But I am not able to figure out how to call that function from the 'c' class pointer . Help me out , maybe its stupid but I am stuck here .

Answer 1

struct A { virtual void foo() {} };
struct B: A { void foo() override {} };
struct C: B {};

auto main() -> int
{
    C o;
    C* p = &o;

    p->foo();    // Calls B::foo
    p->A::foo(); // Calls A::foo
}

Answer 2

如果c是指向C的指针：

c->A::method();