• Subject: Computer Science (Theory)
• Time: 03 Hrs
• Max Marks: 70

Question 1:

(a) What is the difference between Global Variable and Local Variable? Also, give a suitable C++ code to illustrate both.

(b) Which C++ header file(s) will be essentially required to be included to run / execute the following C++ code:

void main()
{
char Msg[ ]="Sunset Gardens";
for (int I=5;I<strlen(Msg);I++)
puts(Msg);
}

(c) Rewrite the following program after removing the syntactical errors (if any). Underline each correction.

#include [iostream.h]
class MEMBER
{
int Mno;float Fees;
PUBLIC:
void Register(){cin>>Mno>>Fees;}
void Display{cout<<Mno<<" : "<<Fees<<endl;}
};
void main()
{
MEMBER M;
Register();
M.Display();
}

(d) Find the output of the following program:

#include <iostream.h>
struct GAME
{ int Score, Bonus;};
void Play(GAME &g, int N=10)
{
g.Score++;g.Bonus+=N;
}
void main()
{
GAME G={110,50};
Play(G,10);
cout<<G.Score<<":"<<G.Bonus<<endl;
Play(G);
cout<<G.Score<<":"<<G.Bonus<<endl;
Play(G,15);
cout<<G.Score<<":"<<G.Bonus<<endl;
}

(e) Find the output of the following program:

#include <iostream.h>
void Secret(char Str[ ])
{
for (int L=0;Str[L]!='\0';L++);
for (int C=0;C<L/2;C++)
if (Str[C]=='A' || Str[C]=='E')
Str[C]='#';
else
{
char Temp=Str[C];

Str[C]=Str[L-C-1];
Str[L-C-1]=Temp;
}
}
void main()
{
char Message[ ]="ArabSagar";
Secret(Message);
cout<<Message<<endl;
}

(f) In the following program, if the value of Guess entered by the user is 65, what will be the expected output(s) from the following options (i), (ii), (iii) and (iv)?

#include <iostream.h>
#include <stdlib.h>
void main()
{
int Guess;
randomize();
cin>>Guess;
for (int I=1;I<=4;I++)
{
New=Guess+random(I);
cout<<(char)New;
}
}

(i) ABBC
(ii) ACBA
(iii) BCDA
(iv) CABD

Question 2:

(a) What do you understand by Data Encapsulation and Data Hiding? Also, give a suitable C++ code to illustrate both.

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

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.

(c) Define a class TEST in C++ with following description: 

Private Members:-

• TestCode of type integer
• Description of type string
• NoCandidate of type integer
• CenterReqd (number of centers required) of type integer
• A member function CALCNTR() to calculate and return the number of centers as (NoCandidates/100+1)

Public Members:-

• A function SCHEDULE() to allow user to enter values for TestCode, Description, NoCandidate & call function CALCNTR() to calculate the number of Centres
• A function DISPTEST() to allow user to view the content of all the data members

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

class PUBLISHER
{
char Pub[12];
double Turnover;
protected:
void Register();
public:
PUBLISHER();
void Enter();
void Display();
};
class BRANCH
{
char CITY[20];
protected:
float Employees;

public:
BRANCH();
void Haveit();
void Giveit();
};
class AUTHOR : private BRANCH , public PUBLISHER
{
int Acode;
char Aname[20];
float Amount;
public:
AUTHOR();
void Start();
void Show();
};

(i) Write the names of data members, which are accessible from objects belonging to class AUTHOR.
(ii) Write the names of all the member functions which are accessible from objects belonging to class BRANCH.
(iii) Write the names of all the members which are accessible from member functions of class AUTHOR.
(iv) How many bytes will be required by an object belonging to class AUTHOR?

Question 3:

 (a) Write a function in C++ to merge the contents of two sorted arrays A & B into third array C. Assuming array A and B are sorted in ascending order and the resultant array C is also required to be in ascending order.

(b) An array S[40][30] is stored in the memory along the row with each of the element occupying 2 bytes, find out the memory location for the element S[20][10], if the Base Address of the array is 5000.

(c) Write a function in C++ to perform Insert operation in a dynamically allocated Queue containing names of students.

(d) Write a function in C++ to find the sum of both left and right diagonal elements from a two dimensional array (matrix).

(e) Evaluate the following postfix notation of expression:

20, 30, +, 50, 40, - ,*

Question 4:

(a) Observe the program segment given below carefully and fill the blanks marked as Statement 1 and Statement 2 using seekp() and seekg() functions for performing the required task. 

#include <fstream.h>
class Item
{
int Ino;char Item[20];
public:
//Function to search and display the content from a particular record number
void Search(int );
//Function to modify the content of a particular record number
void Modify(int);
};
void Item::Search(int RecNo)
{
fstream File;
File.open("STOCK.DAT",ios::binary|ios::in);
______________________ //Statement 1
File.read((char*)this,sizeof(Item));
cout<<Ino<<"==>"<<Item<<endl;
File.close();
}
void Item::Modify(int RecNo)
{
fstream File;
File.open("STOCK.DAT",ios::binary|ios::in|ios::out);

cout>>Ino;cin.getline(Item,20);
______________________ //Statement 2
File.write((char*)this,sizeof(Item));
File.close();
}

(b) Write a function in C++ to count the number of lines present in a text file "STORY.TXT".

(c) Write a function in C++ to search for a BookNo from a binary file "BOOK.DAT", assuming the binary file is containing the objects of the following class. 

class
{
int Bno;
char Title[20];
public:
int RBno(){return Bno;}
void Enter(){cin>>Bno;gets(Title);}
void Display(){cout<<Bno<<Title<<endl;}
};

Question 5:

(A) Write SQL commands for the flowing statements:
(i) To display the names of all activities with their Acodes in descending order.
(ii) To display sum of PrizeMoney for the Activities played in each of the Stadium separately.
(iii) To display the coach's name and ACodes in ascending order of ACode from the table COACH
(iv) To display the content of the Activity table whose ScheduleDate earlier than 01/01/2004 in ascending order of ParticipantsNum.

(B) Give the output of the following SQL queries:
(i) SELECT COUNT(DISTINCT ParticipantsNum) FROM ACTIVITY;
(ii) SELECT MAX(ScheduleDate),MIN(ScheduleDate) FROM ACTIVITY;
(iii) SELECT Name,ActivityName FROM ACTIVITY A,COACH C
WHERE A.Acode=C.Acode AND A.ParticipantsNum=10;
(iv) SELECT DISTINCT Acode FROM COACH;

Question 6:

a) Compare any two Switching techniques.

b) Which of the following is not a Client Side script:
(i) VB Script
(ii) Java Script
(iii) ASP
(iv) PHP

c) If someone has hacked your Website, to whom you lodge the Complain?

d) What do you mean by IP Address? How is it useful in Computer Security?

e) What do you mean by Spam Mails? How can you protect your mailbox from Spams?

f) Mention any two advantages of Open Source Software over Proprietary Software.