Why does this induce a compiler error?

Question

class A{
public:
int f(int x) {cout <<x; }
};
class B: public A{
public:
int() {cout <<5; }
};
int main() {
B ob; // new object created, so far this prints 5 right?
ob.f(7); // won't this print 7 since it's calling the base class (class A's) function?
}

// outputs compiler error

What caused the compiler error?

Answer 1

Solus this is because function f() is a function which should return an integer but there is no return statement inside it.

Answer 2

Solus here is the fixed code👇
https://code.sololearn.com/cBONIJ2MEZ01/?ref=app

Answer 3

In public member block of class B:

int() { cout << 5; }

What was that? an anonymous function?

Answer 4

Basically a lack of return statements was the problem.

If there were return statements in both the base and derived classes, could we then expect an output of 57?