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Explain what is nested class

Nested Classes in C++:

A class defined within another class is a nested class.

Nested class' scope is within its enclosing class. Nested class name is not visible outside the enclosing class without qualifying it with enclosing class name. That is, enclosing_class_name::nested_class_name.

Example of nested classes in C++:

class Employee
  class Data

    int age;
    int unique_id;
    void display()
    { cout<<unique_id<< " " <<age; }


  void printData( Data d)

int  main()
  Employee emp;
  Employee::Data d;