JuniorTheoryCommon

What does the program print?

Vehicle v = new Taxi();
Console.WriteLine(v.Who());

class Vehicle { public virtual string Who() => "V"; }
class Car : Vehicle { public override string Who() => "C"; }
class Taxi : Car
{
    public override string Who() => "T" + base.Who();
}

Expecting V: the variable has type Vehicle, but Who is virtual, so the version comes from the object's type, Taxi.
Expecting TV or TCV: base.Who() runs only the version of the direct base class Car, and Car.Who does not call Vehicle.Who.

What does the program print if Taxi has no Who method of its own?
What happens at compile time if virtual is removed from Vehicle.Who?

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JuniorTheoryCommon

What does the program print?

Vehicle v = new Taxi();
Console.WriteLine(v.Who());

class Vehicle { public virtual string Who() => "V"; }
class Car : Vehicle { public override string Who() => "C"; }
class Taxi : Car
{
    public override string Who() => "T" + base.Who();
}

Expecting V: the variable has type Vehicle, but Who is virtual, so the version comes from the object's type, Taxi.
Expecting TV or TCV: base.Who() runs only the version of the direct base class Car, and Car.Who does not call Vehicle.Who.

What does the program print if Taxi has no Who method of its own?
What happens at compile time if virtual is removed from Vehicle.Who?

Back to questions Open topic in roadmap →Answer it yourself — Quiz