Methods in C++

Concrete Method (Normal Method)

• Fully defined inside the class.

CopyCopyclass A {
public:
    void display() { cout << "Hello" << endl; }  // normal method
};

Virtual Method

• Declared with virtual, can be overridden in derived classes.

CopyCopyclass A {
public:
    virtual void show() { cout << "A’s show" << endl; }
};

Pure Virtual Method (Abstract Method)

• Declared with = 0, has no body in the base class.

• Must be implemented in the derived class.

CopyCopyclass A {
public:
    virtual void draw() = 0;  // pure virtual (abstract method)
};