Page 94 - DCAP404 _Object Oriented Programming
P. 94
Unit 4: Classes and Objects
return sum; Notes
}
};
int main()
{
Calculator obj;
obj.num1 = 2;
ChildCalculator myChildObj;
int result = myChildObj.add();
cout << result;;
return 0;
}
An external function cannot access a protected member of a class (base class); however, a derived
class method can access a protected member of the base class.
Notes A member of a class can access any member of the same class independent of
whether the member is public, protected or private.
You should now know the role of the access specifiers: public, protected and private as applied
to classes. In one of the following parts of the series, we shall see the role of the access specifiers
in the declarator of a derived class.
A public member of a class is accessible by external functions and a derived class. A private
member of a class is accessible only by other members of the class; it is not accessible by external
functions and it is not accessible by a derived class. A protected member of a class is accessible
by a derived class (and other members of the class); it is not accessible by an external function.
Self Assessment
Fill in the blanks:
12. The access-specifier determines the access to the names that follow it, up to the next access-
specifier or the end of the class……………………. .
13. A public member of a class is accessible by ……………………. functions and a derived
class.
14. If a member of a class is……………………, it cannot be accessed by an external function;
even a derived class cannot access it.
15. With the ……………………. access specifier, an external function can access the public
members of the class.
LOVELY PROFESSIONAL UNIVERSITY 87
