NCERT Solutions for Class 12 Help.html Computer Science With C++ Chapter 2 Object Oriented Programming

Differentiate between private and public members of a class in the context of Object Oriented Programming. Also, give a suitable example illustrating accessibility/non-accessibility of each using a class and an object in C++.

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

class EXAM
{
	long Code;
	char EName[20];
	float Marks;
	public:
	EXAM() //Member Function 1
	{
		Code=100;strcpy(EName,'Noname');Marks=0;
	}
	EXAM(EXAM &E) //Member Function 2
	{
		Code=E.Code+1;
		strcpy(EName,E.EName);
		Marks=E.Marks;
	}
};
void main()
{
___________________ //Statement 1
___________________ //Statement 2
}

(i) Which Object-Oriented Programming feature is illustrated by the Member Function 1 and Member Function 2 together in the class EXAM?

(ii) Write Statement 1 and Statement 2 to execute Member Function 1 and Member Function 2 respectively.

Write the definition of a class RING in C++ with the following description:

Private Members
  - RingNumber  // data member of integer type
  - Radius         // data member of float type
  - Area           // data member of float type
  - CalcArea() // Member function to calculate and assign
                   // Area as 3.14 * Radius*Radius
Public Members 
  - GetArea() // A function to allow user to enter values of
                  // RingNumber and Radius. Also, this
                 // function should call CalcArea() to calculate
                // Area
- ShowArea() // A function to display RingNumber, Radius
                   // and Area

Answer the questions (i) to (iv) based on the following:

class One
{
	int A1;
protected:
	float A2;
public:
	One();
	void Get1(); void Show1();
};

class Two :
private One
{
	int B1;
protected:
	float B2;
public:
	Two();
	void Get2();
	void Show();
};

class Three : public Two
{
	int C1;
public:
	Three();
	void Get3();
	void Show();
};
void main()
{
Three T;		//Statement 1
_______;		//Statement 2
}

(i) Which type of Inheritance out of the following is illustrated in the above example?
-Single Level Inheritance, Multilevel Inheritance, Multiple Inheritance.

(ii) Write the names of all the member functions, which are directly accessible by the
object T of class Three as declared in main() function.

(iii) Write Statement 2 to call function Show() of class Two from the object T of Class Three.

(iv) What will be the order of execution of the constructors, when the object T of
class Three is declared inside main()?

Write the definition of a function Reverse(int Arr[], int N) in C++, which should reverse the entire content of the array Arr having N elements, without using any other array.

Example: if the array Arr contains

Then the array should become

NOTE:

• The function should only rearrange the content of the array.
• The function should not copy the reversed content in another array.
• The function should not display the content of the array.

Write a definition for a function ADDMIDROW(int MAT[][10], int R, int C) in C++, which finds sum of the middle row elements of the matrix MAT (Assuming C represents the number of Columns and R represents the number of rows, which is an odd integer).
For example, if the content of array MAT having R as 3 and C as 5 is as follows:

Differentiate between private and public members of a class in the context of Object Oriented Programming. Also, give a suitable example illustrating accessibility/non-accessibility of each using a class and an object in C++.

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

class TEST
{
	long TCode;
	char TTitle[20];
	float Score;
public:
TEST()			//Member Function 1
{
	TCode=100;strcpy(TTitle,”FIRST Test”);Score=0;
}
TEST(TEST &T)      //Member Function 2
{
	TCode=E.TCode+1;
	strcpy(TTitle,T.TTitle);
	Score=T.Score;
}
};
void main()
{
_________________	//Statement 1
_________________	//Statement 2
}

(i) Which Object-Oriented Programming feature is illustrated by the Member Function 1 and Member Function 2 together in the class TEST?
(ii) Write Statement 1 and Statement 2 to execute Member Function 1 and Member Function 2 respectively.

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

class FICTION
{
	long FCode;
	char FTitle[20];
	float FPrice;
public:
FICTION() //Member Function 1
{
	cout<<'Bought'<<endl;
	FCode=100;strcpy(FTitle,'Noname');FPrice=50;
}
FICTION(int C,char T[],float P) //Member Function 2
{
	FCode=C;
	strcpy(FTitle,T);
	FPrice=P;
}
void Increase(float P) //Member Function 3
{
	FPrice+=P;
}
void Show() //Member Function 4
{
	cout<<FCode<<':'<<FTitle<<':'<<FPrice<<endl;
}
~FICTION() //Member Function 5
{
	cout<<'Fiction removed!'<<end1;
}
};
void main()	 //Line 1
{               //Line 2
FICTION F1,F2(101,'Dare',75); 	//Line 3
for (int I=0;I<4;I++) 		//Line 4
{    //Line 5
	F1.Increase(20);F2.Increase(15); 	//Line 6
	F1.Show();F2.Show();  	//Line 7
}		//Line 8
}		//Line 9

Which specific concept of object-oriented programming out of the following is illustrated by Member Function 1 and Member Function 2 combined together?

1. Data Encapsulation
2. Data Hiding
3. Polymorphism
4. Inheritance

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

class FICTION
{
	long FCode;
	char FTitle[20];
	float FPrice;
public:
FICTION()         //Member Function 1
{
	cout<<'Bought'<<endl;
	FCode=100;strcpy(FTitle,'Noname');FPrice=50;
}
FICTION(int C,char T[],float P) //Member Function 2
{
	FCode=C;
	strcpy(FTitle,T);
	FPrice=P;
}
void Increase(float P) //Member Function 3
{
	FPrice+=P;
}
void Show() //Member Function 4
{
	cout<<FCode<<':'<<FTitle<<':'<<FPrice<<endl;
}
~FICTION() //Member Function 5
{
	cout<<'Fiction removed!'<<end1;
}
};
void main() //Line 1
{               //Line 2
FICTION F1,F2(101,'Dare',75); //Line 3
for (int I=0;I<4;I++)                //Line 4
{                                             //Line 5
F1.Increase(20);F2.Increase(15); //Line 6
F1.Show();F2.Show();     //Line 7
}     //Line 8
}      //Line 9

How many times the message 'Fiction removed!' will be displayed after executing the above C++ code? Out of Line 1 to Line 9, which line is responsible to display the message 'Fiction removed!'?