SECTION A [Only for candidates, who opted for C++]

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1 PRINCE PUBLIC SCHOOL HALF YEARLY EXAMINATION ( ) SAMPLE PAPER-1 COMPUTER SCIENCE XII TIME ALLOWED: 3 HOURS MAXIMUM MARKS: 70 General Instructions 1. This question paper conations 4 questions. 2. SECTION A refers to programming language C SECTION C is compulsory for all. 4. All questions are compulsory within each section. SECTION A [Only for candidates, who opted for C++] Q1. a) Name the header files, to which the following built-in functions belong. 4 i) atoi() ii) isalnum() iii) setw() iv) strcpy() b) Write the type of C++ tokens (keywords and user defined identifiers) from thefollowing. 2 i) For ii) delete iii) default iv) Value c) Rewrite the following program after removing the syntactical errors (if any). Underline each correction.3 #include <iostream.h> struct Pixels intcolor,style; voidshowpoint(pixels P) cout<<p.color,p.style<<endl; void main() Pixels Point1=(5,3); ShowPoint(Point1); Pixels Point2=Point1; Color.Point1+=2; ShowPoint(Point2); d) Find the output of the following program. 3 #include <iostream.h> #include <ctype.h> void Secret (char Mig[ ], int N); void main ( ) char SMS[ ] = reportme ; SecretSMS,2); cout<<sms<<end1; void Secret(char Msg[ ], int N) for (int C=0; Msg[C]!= \0 ;C++) - 1 -

2 if (C%2==0) Msg[C] = Msg[C]+N; else if (isupper(msg[c])) Msg[C] = tolower(msg[c]); else Msg[C] = Msg[C]-N; e) In the following program, find the correct possible output(s) from the options. 3 #include<stdlib.h> #include<iostream.h> void main( ) randomize( ); char City[][10]= DEL, CHN, KOL, BOM, BNG ; int Fly; for(int I=0; I<3;I++) Fly=random(2) + 1; cout<<city[fly]<< : ; Outputs: i) DEL : CHN : KOL: ii) CHN: KOL : CHN: iii) KOL : BOM : BNG: iv) KOL : CHN : KOL: f) Obtain the output of the following C++ program asexpected to appear on the screen afterits execution. 3 Important Note:- All the desired header files are already included in the code, which are required to run the code. void main( ) char *Text= AJANTA ; int *P,Num[ ]=1,5,7,9; P=Num; cout<<*p<<text<<endl; Text++; P++; cout<<*p<<text<<endl; g) Differentiate between actual and formal parameters. 3 Q2. a) How does OOP overcome the shortcomings of traditional programming approaches? 2 b) Differentiate between private and public member of a class in context of Object Oriented Programming. Also give a suitable example illustrating accessibility/non-accessibilityof each using a class and an object in C++. 2 c) Compare the usefulness of default arguments and function overloading, supporting your answer with appropriate examples. 2 d) Define a class ITEM in C++ with the following description. 4 Private Members Code of type integer (Item Code) Iname of type string (Item Name) Price of type float (Price of each item) Qty of type integer (Quantity of item in stock) Offer of type float (Offer percentage on the item) A member function GetOffer( ) to calculate Offer percentage as per the following rule

3 If Qty <= 50 Offer is 0 If 50 < Qty <= 100 Offer is 5 If Qty >100 Offer is 10 Public Members A function GetStock( ) to allow user to enter values for Code, Iname, Price, Qty and call functiongetoffer( ) to calculate the offer. A function ShowItem( ) to allow user to view the content of all the data members. e) Distinguish between the following two statements. 2 i) Date D1 ( 13, 10, 2011 ) ; ii) Date D1 = Date( 13, 10, 2011) ; f) Answer the questions(i) and (ii) after going through the following. 2 class Seminar int Time; 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) Which category of constructor - Function 4 belongs to and when does it get called? ii) Which concept is illustrated by Functions 1 and 3? Write statements that would call these functions. g) Answer the questions (i) to (vi) based on the following. 6 class Exterior intorderid; char Address[20]; protected: float Advance; Exterior(); void Book(); void View(); ; classpaint:public Exterior intwallarea,colorcode; protected: char Type; - 3 -

4 Paint() ; voidpbook(); voidpview(); ; classbill:public Paint float Charges; void Calculate(); Bill() ; void Billing() ; void Print() ; ; i) Write the names of all the data members which are directly accessible from member functions of class Paint. ii) Which type of inheritance is illustrated in the above example? iii) Write the names of all the member functions which are accessible from object of class Bill. iv) Write the names of all the member functions which are accessible from object of class Exterior. v) How many bytes will be required by an object belonging to class BILL? vi) What will be the order of execution of the constructors, when the object T of class Bill is declared inside main ( )? Q3. a) Write the command to open a file named Student. File stream object is File1. Give the command to open the file in both constructor method and open(). 2 b) Write a function in c++ to count & display Maximum length of line, that lines not starting with A present in a text file PARA.TXT. 3 c) Write a definition for function COUNTDEPT( ) in C++ to read each object of abinary file TEACHERS.DAT, find and display the total number of teachers in thedepartment MATHS. Assume that the file TEACHERS.DAT is created with thehelp of objects of class TEACHERS, which is defined below. class TEACHERS 3 int TID; char DEPT[20]; void GET() cin>>tid;gets(dept); void SHOW() cout<<tid<<":"<<dept<<end1; char *RDEPT()return DEPT; ; d) Write a definition for function Economic() in C++ to read eachrecord of a binary file ITEMS.DAT,find and display those items,which costs less than Assume that the file ITEMS.DAT iscreated with the help of objects of class ITEMS, which is definedbelow. 3 class ITEMS intid;char GIFT[20]; float Cost; public : void Get() - 4 -

5 ; cin>>code;gets(gift);cin>>cost; void See() cout<<id<<":"<<gift<<":"<<cost<<endl; floatgetcost() return Cost;. SECTION C [ For all the Candidates ] Q4. a) Identify the type of topology on the basis of the following. 2 i) Since every node is directly connected to the server, a large amount of cable is needed which increases the installation cost of the network. ii) It has a single common data path connecting all the nodes. b) Expand. 2 i) VSLI ii)dhtml iii)xml iv) HTML c) Give two advantages of using optical fibres. 2 d) What is the importance of URL in networking? 2 e) What is cracking? How it is different fromhacking? 2 f) What is web hosting? 1 g) Daniel has to share the data among various computers of his two offices branches situated in the same city. Name the network (out of LAN, WAN, PAN and MAN) which is being formed in this process. 1 h) Which protocol is used to creating a connection with a remote machine? 1 i) What is the basic difference between Trojan horse and computer worm? 1 j) Raidient Technology in Kanpur is setting up the network among its different branches. There are four branches named as Shanti Nagar (BGN), Saket Nagar (LHT), Govind Nagar (V) and Azad Nagar (A). Distance between various branches are given below. 4 Shortest distances between various buildings. Branch BGN to V 7 Km Branch V to LHT 4 Km Branch V to A 3 Km Branch BGN to LHT 4 Km Branch BGN to A 3.5 km Branch LHT to A 1 km Numbers of Computers installed at various buildings are as follows. Branch BGN 137 Branch V 65 Branch A 29 Branch LHT 98 i) Suggest the suitable topology for networking the computer of all the branches. ii) Name the branch where server should be installed. Justify your answer. iii) Suggest the placement of hub or switches in the network. iv) Mention any economic way to provide internet accessibility to all branches

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