xii cbse previous year question paper question no 2 (b) 2 marks

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 2006class Interview{ int month;public:Interview(int y) {month=y;} //Constructor 1Interview(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);ORint 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 2006class Exam{ int year;public:Exam(int y) { year=y;} //Constructor 1Exam(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;}ORCopy 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)

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

(b) Answer the questions (i) and (ii) after going 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 ConstructorFunction 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)

(b) Answer the questions (i) and (ii) after going through the following class

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

(b) Answer the questions (i) and (ii) after going through the following class

Outside Delhi 2007 2{~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 ConstructorFunction 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 ORexample)NOTE: If the error in declaration of the destructor is specified then marks for the destructor function should be allocated.

(b) Answer the questions (i) and (ii) after going 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”);

(b) Answer the questions (i) and (ii) after going through the following program Delhi 2008 2

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

(b) Answer the questions (i) and (ii) after going through the following program Delhi 2008 2

void main ( ){Bazar B; / /Statement 1B. 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)(ii) What shall be the possible output when the 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 begenerated:Electronic-Calculator:10@225

(1 Mark for correct answer)OR(½ Mark each for the String and Numeric values)

(b) Answer the questions (i) and (ii) after going through the following program:

Outside Delhi 2008 2#include<iostream.h>#include<string.h>class Retail{char Category [20];char Item [20];int Qty;float Price;


Outside Delhi 2008 2Retail ( ) // Function 1{strcpy (Category, “Cereal”);strcpy (Item, “Rice”);Qty = 100;Price = 25;public:void Show ( ) // Function 2{cout<<Category<<“–”<<Item<<“ : ”<<Qty


Outside Delhi 2008 2<<“@”<<Price<<endl;}};void main ( ){Retail R; // Function 1R. Show ( ) ;. // Function 2}


Outside Delhi 2008 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.(ii) What shall be the possible output when the program gets executed? (Assuming, if required - the suggested correction(s) are made in theprogram)

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 2009class 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 DestructorOR Overloaded Function OR Copy Constructor?(ii) WORK W ; //Statement 1WORK Y (W) ; //Statement 2


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 1Destructor.(½ Mark for naming Function 1 correctly)(½ Mark for naming it as Destructor,(ii) WORK W; // Statement 1WORK Y(W); // Statement 2Which 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 4Copy Constructor.(½ Mark for naming Function 4 correctly)(½ Mark for naming it as Copy Constructor)

(b) Answer the questions (i) and (ii) after going through the following class:

Outside Delhi 2009 2class Job{int JobId;char JobType;public:~Job ( ) //Function 1{ cout<< “Resigned” <<end1; }Job ( ) //Function 2{ JobId=10 ; JobType =‘T” ;}


Outside Delhi 2009 2void 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 thescope of an object gets over? Is it known as Constructor OR Destructor OR Overloaded Function OR Copy Constructor?



(ii) Job P ; //Line 1Job Q(P) ; //Line 2

Which member function out of Function 1, 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 1Job Q(P) ; //Line 2Which member function out of Function 1, 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 2class TEST{int Regno, Max, Min, Score;public:TEST() //Function 1{Regno= 101;Max=100;Min=40;Score=75;}


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


Delhi 2009 2void 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) PolymorphismORFunction OverloadingORConstructor 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)


Outside Delhi 2009 2class Exam{int Rno,MaxMarks,MinMarks,Marks;public:Exam() //Module 1{Rno=101; MaxMarks=100; MinMarks=40;Marks=75;}


Outside Delhi 2009 2Exam(int Prno, int Pmarks) //Module 2{Rno=Prno;MaxMarks=l00;MinMarks=40;Marks=Pmarks;}~Exam() //Module 3{cout<<“Exam Over”<<endl;}


Outside Delhi 2009 2void 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. PolymorphismORConstructor OverloadingORFunction Overloading(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#include<iostream.h>void Print ( ) // Function [I]{for (int K=1 ; K<=60 ; K++) cout<< "-" ;cout<<end1 ;}


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


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


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


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

Ans. @@@@91827

ORNo Output as L is not declared in void Print (int N)

PolymorphismOR

Function Overloading

(½ Mark for writing each correct line of output)(1 Mark for writing the feature name correctly)

(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] Outside Delhi 2010 2#include<iostream.h>void Line ( ) //Function [I]{for (int L=1;L<=80;L++) cout<<"-";cout<<end1;}

(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] Outside Delhi 2010 2

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)


Sample Paper 2010 SET I 2class Seminar{int Time;public:Seminar() //Function 1{Time=30;cout<<"Seminar starts now"<<end1;}


Sample Paper 2010 SET I 2void Lecture() //Function 2{cout<<"Lectures in the seminar on"<<end1;}Seminar(int Duration) //Function 3{Time=Duration;cout<<"Seminar starts now"<<end1;}


Sample Paper 2010 SET I 2~Seminar()//Function 4{cout<<"Vote of thanks"<<end1;}};i) In Object Oriented Programming, what is Function 4 referred as and when does it getinvoked/called?


Sample Paper 2010 SET I 2

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 1Seminar S2(90); //Function 3( ½ Mark for mentioning the correct concept)( ½ Mark for the example)


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


SAMPLE PAPER 2010 SET II 2

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 1Match N(10); //Function 3( ½ Mark for each statement)

SAMPLE PAPER 2012 SET I 2

THANK YOU

xii cbse previous year question paper question no 2 (b) 2 marks

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