C Potential Interview Question Too hard

Question

Don't run this code and answer which foo will be called. Why? Which method?

class A
{
   public void Foo( int n )
   {
      Console.WriteLine( "A::Foo" );
   }
}

class B : A
{
   /* note that A::Foo and B::Foo are not related at all */
   public void Foo( double n )
   {
      Console.WriteLine( "B::Foo" );
   }
}

static void Main( string[] args )
{
   B b = new B();
   /* which Foo is chosen? */
   b.Foo( 5 );
}

I came across this problem here: https://www.wiktorzychla.com/2008/06/c-puzzle-no8-beginner.html

I plan to use this as an interview question. Any ideas?

Answer 1

This isn't a question I'd ask in an interview. I know the answer and why it's correct, but something like this should only happen once in a while, so it shouldn't be a problem. Knowing the solution doesn't reveal much about a candidate's coding ability.

Even if A.Foo is virtual and B overrides it, the result will be the same.