Inherited Function Calling – Computer Sir Ki Class

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Exam Questions-CBSE12A-2018-02B #CPP#5235    siteicon   siteicon  

Problem Statement - Inherited Function Calling

Observe the following C++ code and answer the questions (i) and (ii).
Note : Assume all necessary files are included.

class FIRST
{
  int Num1;
  public:
  void Display() //Member Function 1
  {
    cout<<Num1<<endl;
  }
};
class SECOND: public FIRST
{
  int Num2;
  public:
  void Display() //Member Function 2
  {
    cout<<Num2<<endl;
  }
};
void main()
{
  SECOND S;
  ___________________ //Statement 1
  ___________________ //Statement 2
}

(i) Which Object Oriented Programming feature is illustrated by the definitions of
classes FIRST and SECOND?

(ii) Write Statement 1 and Statement 2 to execute Member Function 1 and Member
Function 2 respectively using the object S.

Solution

TC++ #5235

Answer to part (i)
The OOPS concept illustrated by class FIRST and SECOND is called INHERITANCE. 

Note: The answers Encapsulation, Data Abstraction and Data Hiding are also considered correct as per CBSE guidelines, but most appropriate answer is inheritance.

Answer to part (ii)
S.FIRST::Display(); //Statement 1 to call Display routine of class FIRST via object of Class SECOND

S.Display(); //Statement 2 to call Display routine of class SECOND itself as object is of class SECOND.
It can also be S.SECOND::Display(); as even for functions of same class full scope qualifier can be given.

 

Notes

  • In such question statement 1 and 2 can also be interchanged, as it is simply a matter of calling a function which are not interdependent on each other.
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CSKC| Created: 3-Dec-2018 | Updated: 4-Dec-2018|CBSE12A-2018

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