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11th Standard English Medium Computer Science Subject Inheritance Creative 3 Mark Questions with Solution updated Creative Questions

Published on: 13/05/2022

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Std: 11th Standard - Computer Science

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

Write the derived class using any of the three visibility mode.

Can a derived class get access privilege for a private member of the base class? If yes, how?

Write the output of the following program.
//Implementation of Single Inheritance using public
visibility mode
#include < iostream >
using namespace std;
class Shape
{
private:
int count;
protected:
int width;
int height;
public:
void setWidth(int w)
{
width=w;
}
void setHeight(int h)
{
height=h;
}
};
class Rectangle: publicShape
{
public:
int getArea()
{
return (width * height);
}
};
int main()
{
Rectangle Rect;
Rect.setWidth( 5);
Rect.setHeight(7);
II Print the area of theobject.
cour<< "Total area: "<< Rect.getArea() << endl;
return ();
}

In what situation shadowing base class function inderived class arises? How will you resolve the situation?

Explain the uses of private, protected and public inheritance.

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Answers Key:

Generic 3

5 x 3 = 15

Classes can be derived using any of the three visibility mode:
1. In a public base class, public and protected members of the base class remain public and protected members of the derived class.
2. In a protected base class, public and protected members of the base class are protected members of the derived class.
3. In a private base class, public and protected members of the base class become private members of the derived class.

A derived class does not get direct access privilege for a private member of its base class, however, it always can access(indirectly) the private members of its base class through an inherited function that is accessing these members.

Output:
Total area: 35.

In case of inheritance there are situations where the member function of the base class and derived classes have the same name. If the derived class object calls the overloaded member function it leads confusion to the compiler as to which function is to be invoked. The derived class member function have higher priority than the base class member function. This shadows the member function of the base class which has the same name like the member function of the derived class. The scope resolution operator resolves this problem.

(i) Private inheritance should be used when you want the features of the base class to be available to the derived class but not to the classes that are derived from the derived class.
(ii) Protected inheritance should be used when features of base class to be available only to the derived class members but not to the outside world.
(iii) Public inheritance can be used when features of base class to be available the derived class members and also to the outside world.