Bloomberg Financial Software Developer interview questions

read the following code and tell me the output, and is there anything wrong about it? #include <iostream> class A { public: A() { foo(); } virtual void foo(int a = 10) { std::cout << "A = " << a << std::endl; } }; class B : public A { public: B() { foo(); } virtual void foo(int b = 20) { std::cout << "B = " << b << std::endl; } }; int main() { A* aPtr = new B(); aPtr->foo(); delete aPtr; return 0; }