To determine the expected output, let’s analyze the code step by step:

Key Observations

1. Virtual Function in Base Class: The Base class defines a virtual void show() method. This enables dynamic polymorphism (runtime method resolution).
2. Derived Class Override: The Derived class inherits from Base and redefines show() with the same signature. Since the base method is virtual, this is a valid override.
3. Polymorphic Call: In main(), a Base* pointer points to a Derived object. When ptr->show() is called, the runtime system checks the actual type of the object (not the pointer type) and invokes the Derived class’s show() method.

Output

The Derived class’s show() method prints "Derived".

Answer: Derived
\boxed{Derived}

作者声明:本文包含人工智能生成内容。