Qno 2 (b)

XII CBSE
Previous Year
Question Paper
QUESTION NO
2 (b)
2 Marks

2 (b) Answer the questions (i) and (ii) after going
through the following class : Delhi 2006
class Interview
{
int month;
public:
Interview(int y) {month=y;} //Constructor 1
Interview(Interview&t); //Constructor 2
};
(i) Create an object, such that it invokes
Constructor 1 1
(ii) Write complete definition for Constructor 2 1

(b) Interview Ob1(5);
OR
int N=5; Interview Ob1(N);
(1 mark for proper declaration of Object)
Interview(Interview &t)
{
month = t.month;
}
(1 mark for writing proper statements inside definition of Constructor
2)
OR
(1 mark for writing the conceptual definition of the copy constructor)
OR
(Only ½ mark for mentioning the term: copy constructor)
Note: Any valid statement in C++ working with t as an object of
Interview must be accepted while defining the constructor.

(b) Answer the questions (i) and (ii) after going
through the following class : Outside Delhi 2006
class Exam
{
int year;
public:
Exam(int y) { year=y;} //Constructor 1
Exam(Exam & t); //Constructor 2
};
(i) Create an object, such that it invokes
Constructor 1. 1
(ii) Write complete definition for Constructor 2. 1

(ii) Exam (Exam &t)
{year = t.year;}
OR
Copy constructor: It is an overloaded constructor,
in which object of the same class is passed as
parameter.
(1 mark for writing proper statements inside definition of
Constructor 2)
OR
(1 mark for any valid statement in C++ working with t as an
object of Exam)
OR
(1 mark for writing the definition/explanation of the concept of
copy constructor)
OR
(1/2 mark for mentioning only the term copy constructor)

through the following class: Delhi 2007 2
class Science
{
char Topic[20];
int Weightage;
public:
Science ( ) //Function 1
{
strcpy (Topic, “Optics” );
Weightage = 30;
cout<<“Topic Activated”;
}

through the following class: Delhi 2007 2
~Science( ) //Function 2
{
cout’<<”Topic Deactivated”;
}
(i) Name the specific features of class shown by
Function 1 and Function 2 in the above example.
(ii) How would Function 1 and Function 2 get
executed ?

(b) (i) Function 1: Constructor/ Default
Constructor
Function 2: Destructor
(½ Marks for each correct answer)
(ii) Function 1 is executed or invoked
automatically when an object of class Science
is created.
Function 2 is invoked automatically when the
scope of an object of class Science comes to
an end.
OR

(b)
Example:
{
Science s1;//Constructor is invoked
} // the destructor is invoked
(½ Mark for each correct answer through
explanation OR example)

through the following class
Outside Delhi 2007 2
class Maths
{
char Chapter [20];
int Marks;
public:
Maths ( ) //Member Function 1
{
strcpy (Chapter, “Geometry”);
Marks = 10;
cout<<“Chapter Initialised”;

through the following class
{
~Math () //Member Function 2
}
cout<<”Chapter Over”;
}
};
(i) Name the specific features of class shown by
Member Function 1 and Member Function 2 in the
above example.
(ii) How would Member Function 1 and Member
Function 2 get executed?

(b) (i) Function 1: Constructor OR Default
Constructor
Function 2: Destructor
(½ Marks for each correct answer)
(ii) Function 1 is executed or invoked
automatically when an object of class Maths is
created.
Function 2 is invoked automatically when the
scope of an object of class Maths comes to an
end.
OR

(b)
Example:
{
Maths s1; //Constructor is invoked
} //Destructor is invoked
(½ Mark for each correct answer through
explanation OR
example)
NOTE: If the error in declaration of the
destructor is specified then marks for the
destructor function should be allocated.

through the following program Delhi 2008 2
#include<iostream.h>
#include<string.h>
class Bazar
{
char Type[20];
char Product[20];
int Qty;
float Price;
Bazar ( ) //Function 1
{
strcpy (Type, “Electronic”);

strcpy (Product, “Calculator”);
Qty=10;
Price=225;
}
public:
void Disp ( ) / / Function 2
{
cout<<Type<<“-”<<Product<<“:”<<Qty
<<“@” <<Price<<endl;
}
};

void main ( )
{
Bazar B; / /Statement 1
B. Disp ( ); / / Statement 2
}
(i) Will Statement 1 initialize all the data members for
object B with the values given in the Function I? (Yes
OR No). Justify your answer suggesting the
correction(s) to be made in the above code.
(ii) What shall be the possible output when the
program gets executed? (Assuming, if required - the
suggested correction(s) are made in the program)

Ans: No, since the constructor Bazar has
been defined in private section Suggested
Correction: Constructor Bazar() to be ,
defined in public
(½ Mark for identifying NO)
(½ Mark for justification and correction)
program gets executed?
(Assuming, if required - the suggested
correction(s) are made in the Program)

If the constructor is defined as a public
member, the following output shall be
generated:
Electronic-Calculator:10@225
(1 Mark for correct answer)
OR
(½ Mark each for the String and Numeric
values)

through the following program:
#include<string.h>
class Retail
{
char Category [20];
char Item [20];
int Qty;
float Price;

Retail ( ) // Function 1
{
strcpy (Category, “Cereal”);
strcpy (Item, “Rice”);
Qty = 100;
Price = 25;
public:
void Show ( ) // Function 2
{
cout<<Category<<“–”<<Item<<“ : ”<<Qty

<<“@”<<Price<<endl;
}
};
void main ( )
{
Retail R; // Function 1
R. Show ( ) ;. // Function 2
}

(i) Will Statement 1 initialize all the data
members for object R with the values given in
the Function 1 ? (Yes OR No). Justify your
answer suggesting the correction(s) to be
made in the above code.
program gets executed? (Assuming, if required
- the suggested correction(s) are made in the
program)

Ans: i) No, since the constructor Retail has
been defined in private section.
Suggested Correction: Constructor RetailO to
be defined in public section of class.
(½ mark for identifying No)
(½ mark for justification)

2 (b) Answer the questions (i) and (ii) after
going through the following class:
Delhi 2009
class WORK 2
{
int WorkId;char WorkType ;
public:
-WORK ( ) //Function 1
{ cout<<”Un-Allocated”<<endl ;}
void status ( ) //Function 2
{ cout<<WorkId<<”: “<<WorkType<<endl ;}
WORK ( ) //Function 3

Delhi 2009
{ WorkId = 10; WorkType=’T’ ; }
WORK(WORK &W) //Function 4
{
WorkId=W. WorkId+12;WorkType=W.
WorkType+l
}
} ;

Delhi 2009
(i) Which member function out of Function 1,
Function 2, Function 3 and Function 4 shown
in the above definition of class WORK is called
automatically, when the scope of an object
gets over? Is it known as Constructor OR
Destructor
OR Overloaded Function OR Copy
Constructor?
(ii) WORK W ; //Statement 1

Delhi 2009
Which member function out of Function 1,
Function 2, Function 3 and Function4 shown in
the above definition of class WORK will be
called on execution of statement written as
statement 2 ? What is this function specifically
known as out of Destructor or Copy
Constructor or Default Constructor?

Ans Function 1
Destructor.
(½ Mark for naming Function 1 correctly)
(½ Mark for naming it as Destructor,
(ii) WORK W; // Statement 1
WORK Y(W); // Statement 2
Which member function out of Function 1, Function 2,
Function 3 and Function4 shown in the above definition
of class WORK will be called on execution of statement
written as statement 2 ? What is this function specifically
known as out of Destructor or Copy Constructor or
Default Constructor?
Ans Function 4
Copy Constructor.
(½ Mark for naming Function 4 correctly)
(½ Mark for naming it as Copy Constructor)

through the following class:
class Job
{
int JobId;char JobType;
public:
~Job ( ) //Function 1
{ cout<< “Resigned” <<end1; }
Job ( ) //Function 2
{ JobId=10 ; JobType =‘T” ;}

void TellMe( )//Function 3
{ cout<<JobId<< “: ” <<JobType<<end1; }
Job (Job &J) //Function 4
{
JobId=J.JobId+10; JobType=J.JobType+l;
}
};

(i) Which member function out of Function 1,
Function 2, Function 3 and Function 4 shown in
the above definition of class Job is called
automatically, when the
scope of an object gets over? Is it known as
Constructor OR Destructor OR Overloaded
Function OR Copy Constructor?

(ii) Job P ; //Line 1
Job Q(P) ; //Line 2
Function 2, Function 3 and Function 4 shown in
the above definition of class Job will be called
on execution of statement written as Line 2 ?
What is this function specifically known as out
of Destructor or Copy Constructor or Default
Constructor?

Ans Function 1.
Destructor.
( ½ Mark for mentioning the correct function)
( ½ Mark for identifying it as Destructor)
(ii) Job P ; //Line 1
Job Q(P) ; //Line 2
Function 2, Function 3 and Function4 shown in
the above definition of class Job will be called
on execution of statement written as Line 2 ?
What is this function specifically known as out
of Destructor or Copy Constructor or Default
Constructor?

Ans Function 4.
Copy Constructor.
( ½ Mark for mentioning the correct function)
( ½ Mark for identifying it as Copy constructor)

Delhi 2009 2
class TEST
{
int Regno, Max, Min, Score;
public:
TEST() //Function 1
{
Regno= 101;Max=100;Min=40;Score=75;
}

Delhi 2009 2
TEST(int Pregno,int Pscore) //Function 2
{
Regno=Pregno; Max=100; Min=40;
Score=Pscore;
}
~TEST() //Function 3
{
cout<<“TEST Over”<<endl;
}

Delhi 2009 2
void Display() //Function 4
{
cout<<Regno<<“:”<<Max<<“:”<<Min<<endl;
cout<<“[Score]”<<Score<<endl;
}
};
(i) As per Object Oriented Programming, which.
concept is illustrated by Function 1 and Function 2
together?
(ii) What is Function 3 specifically referred as ? When
do you think, Function 3 will be invoked/called?

Ans. i) Polymorphism
OR
Function Overloading
OR
Constructor Overloading
(1 Mark for naming the concept correctly)
(ii) Destructor, invoked or called when scope of an
Object gets over.
(½ Mark for naming Destructor correctly)
(½ Mark for mentioning correctly when it is invoked)

class Exam
{
int Rno,MaxMarks,MinMarks,Marks;
public:
Exam() //Module 1
{
Rno=101; MaxMarks=100; MinMarks=40;
Marks=75;
}

Exam(int Prno, int Pmarks) //Module 2
{
Rno=Prno;MaxMarks=l00;MinMarks=40;Marks
=Pmarks;
}
~Exam() //Module 3
{
cout<<“Exam Over”<<endl;
}

void Show () //Module 4
{
cout<<Rno<<“:”<<MaxMarks<<“:”<<MinMarks
<<endl;
cout<<“[Marks Got]”<<Marks<<endl;
}
};

(i) As per Object Oriented Programming, which
concept is illustrated by Module 1 and Module
2 together?
(ii) What is Module 3 referred as ? When do
you think, Module 3 will be invoked/called?

Ans. Polymorphism
OR
Constructor Overloading
OR
(1 Mark for mentioning the correct concept)
(ii) What is Module 3 referred as ? When do you
think, Module 3 will be invoked/called?
Ans. Destructor. It is invoked as soon as the scope
of the object gets over.
(½ Mark for identifying it as Destructor)
(½ Mark for mentioning correctly when it be
called/invoked)

(b) Write the output of the following C++ code.
Also. write the name of feature of Object
Oriented Programming used in the following
program jointly illustrated by the function [I] to
[IV].
Delhi 2010 2
void Print ( ) // Function [I]
{
for (int K=1 ; K<=60 ; K++) cout<< "-" ;
cout<<end1 ;
}

[IV].
Delhi 2010 2
void Print (int N) // Function [II]
{
for (int K=1 ; K<=N ; L++) cout<<"*" ;
cout<<end1 ;
}

[IV].
Delhi 2010 2
void Print (int A, int.B) // Function [III]
{
for (int K=1. ;K<=B ;K++) cout <<A*K ;
cout<<end1 ;
}

[IV].
Delhi 2010 2
void Print (char T, int N) // Function [IV]
{
for (int K=1 ; K<=N ; K++) cout<<T ;
cout<<end1;
}

[IV].
Delhi 2010 2
void main ( )
{
int U=9, V=4, W=3;
char C='@' ;
Print (C,V) ;
Print (U,W) ;
}

Ans.
@@@@
91827
OR
No Output as L is not declared in void Print (int N)
Polymorphism
OR
(½ Mark for writing each correct line of output)
(1 Mark for writing the feature name correctly)

Also, write the .name of feature of Object
[IV] Outside Delhi 2010 2
void Line ( ) //Function [I]
{
for (int L=1;L<=80;L++) cout<<"-";
cout<<end1;
}

void Line (int N) //Function[II]
{
for (int L=l;L<=N;L++) Cout<<"*";
cout<<endl;
}

void Line (char C, int N) //Function [III]
{
for (int L=l;L<=N;L++) cout<<C;
cout<<endl;
}

void Line (int M, int, N) //Function [IV]
{
for (int L=1;L<=N;L++) cout<<M*L;
cout<<end1;
}

void main ( )
{
int A=9, B=4, C=3;
char K= '#' ;
Line (K,B);
Line (A,C);
}

Ans
####
91827
Polymorphism OR Function Overloading
(½ Mark for writing each correct line of output)
(1 Mark for writing the feature. name correctly)

(b) Answer the questions (i) and (ii) after
Sample Paper 2010 SET I 2
class Seminar
{
int Time;
public:
Seminar() //Function 1
{
Time=30;cout<<"Seminar starts now"<<end1;
}

void Lecture() //Function 2
{
cout<<"Lectures in the seminar on"<<end1;
}
Seminar(int Duration) //Function 3
{
Time=Duration;cout<<"Seminar starts
now"<<end1;
}

~Seminar()
//Function 4
{
cout<<"Vote of thanks"<<end1;
}
};
i) In Object Oriented Programming, what is
Function 4 referred as and when does it get
invoked/called?

ii) In Object Oriented Programming, which
concept is illustrated by Function 1 and
Function 3 together? Write an example
illustrating the calls for these functions.

(b)
i) Destructor, it is invoked as soon as the
scope of the object gets over. 2
( ½ Mark for mentioning destructor)
( ½ Mark for remaining answer)
ii) Constructor Overloading (or Function
Overloading or Polymorphism)
Seminar S1; //Function 1
Seminar S2(90); //Function 3
( ½ Mark for mentioning the correct concept)
( ½ Mark for the example)

going through the following program:
SAMPLE PAPER 2010 SET II 2
class Match
{
int Time;
public:
Match()
//Function 1
{
Time=0;
cout<<"Match commences"<<end1; }

void Details() //Function 2
{
cout<<"Inter Section Basketball
Match"<<end1;
}
Match(int Duration) //Function 3
{
Time=Duration;
cout<<"Another Match begins now"<<end1; }

Match(Match &M) //Function 4
{
Time=M.Duration;
cout<<"Like Previous Match "<<end1;
}
};
i) Which category of constructor - Function 4
belongs to and what is the purpose of using it?
ii) Write statements that would call the member
Functions 1 and 3

(b)
i)Copy constructor, It will help to copy the
data from one object to another.
( ½ Mark for mentioning copy constructor)
( ½ Mark for remaining answer)
ii) Match M; //Function 1
Match N(10); //Function 3
( ½ Mark for each statement)

Qno 2 (b)

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