Cbse question paper class_xii_paper_2000

QUESTION PAPER-2000
Computer Science with C++

[DELHI BOARD]

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COMPUTER SCIENCE – 2000
(Delhi Board)

Time allowed: 3 hours Max. Marks: 70
Instructions: (i) All the questions are compulsory.
(ii)Programming Language: C++

Question 1.
(a) Illustrate the concept of function overloading with the help of an example.
(b) Name the header file, to which following built-in functions belong:
(i) isupper() (ii) setw() (iii) exp() (iv) strcmp()
(c) Will the following program execute successfully? If no, state the reason (s).
#include<stdio.h>
void main ()
{
int s1, s2, num;
s1 = s2 = 0;
for (x = 0; x<11; x++)
{
cin << num;
if (num>0)
s1 += num;
else
s2 = /num;
}
cout << s1 << s2;
}
(d) Give the output of following program segment (Assuming all required header files are
included in the program).
char *NAME = “a ProFile”;
for (int x=0;x<strlen(NAME);x++)
if (islower(NAME[x]
NAME [x] = toupper(NAME)[x];
else
if (isupper(NAME[x])
if (x%2!=0)
NAME [x]=tolower(NAME[x-1]);
else
NAME [x]--;
cout << NAME << endl;
(e) Write the output of the following program:
# include <iostream.h>
int func(int &x, int y = 10)
{
if (x%y == 0)

return ++x;
else
return y--;
}
void main()
{
int p=20, q=23;
q=func (p,q);
cout << p << " " << " " << q << endl;
p=func (q);
cout<< p << " " << " " << q << endl;
q=func (p);
cout << p << " " << " " << q << endl;
}
(f) Write a function SEQSUM() in C++ with two arguments, double x and int n. The
function should return a value of type double and it should find the sum of the
Following series :
1 + x / 2! + x2 / 4! + x3 / 6! + x4 / 8! + x5 /10! + ... + xn / (2n)!

Question 2.
(a) Why is a destructor function required in classes? Illustrate with the help of an
example.

b) Define a class WORKER with the following specification :

Private members of class WORKER:
wno integer
wname 25 characters
hrwrk, wgrate float (hours worked and wage rate per hour)
totwage float (hrwrk * wgrate)
calcwg () A function to find hrwrk * wgrate with float return type.
Public members of class WORKER
in_data () a function to accept values for wno, wname, hrwrk, wgrate and invoke
calcwg() function to calculate totpay.
out_data () a function to display all the data members on the screen. You should give
definitions of functions.

c) Consider the following and answer the questions given below : 4
class School
{
int A;
protected :
int B,C;
public:
void INPUT (int);
void OUTPUT ();

};
class Dept: protected School
{
int X Y;
protected :
void IN (int, int);
public:
void OUT();
};
class Teacher : public Dept
{
int P;
void DISPLAY (void);
public :
void ENTERO;
};

i. Name the base class and derived class of the class Dept.
ii. Name the data member (s) that can be accessed from function OUT ().
iii. Name the private member function(s) of class Teacher.
iv. Is the member function OUT() accessible by the objects of Dept?

Question 3.
(a) Suppose A, B, C are arrays of integers of size M, N, and M + N respectively. The
numbers in array A appear in ascending order while the numbers in array B appear in
descending order. Write a user defined function in C++ to produce third array C by
merging arrays A and B in ascending order. Use A, B and C as arguments in the function.
b) An array VAL ([1..15][1..10] is stored in the memory with each element requiring 4
bytes of storage. If the base address of array VAL is 1500, determine the location of VAL
(12] [9], when the array VAL is stored (i) Row wise (ii) Column wise. 3
c) Write a user-defined function in C++ to find and display the sum of both the diagonal
elements of a two-dimensional array MATRIX [6] [6] containing integers.
d) Evaluate the following postfix expression using a stack. Show the contents of stack
after execution of each operation.
20, 8, 4,/, 2,3,+,*,-
e) Give necessary declarations for a queue containing float type numbers; also write a
user-defined function in C++ to insert a float type number in the queue. You should use
linked representation of queue.

Question 4.
(a) Name two member functions of ofstream class.
(b) Assuming the class? DRINKS defined below, write functions in C++ to perform the
following:
i. Write the objects of DRINKS to a binary file.
ii. Read the objects of DRINKS from binary file and display them on the screen
when DNAME has value "INDY COLA".

class DRINKS
{
int DCODE;
char DNAME[13]; // Name of the drink
int DSIZE; // Size in liters
float DPRICE;
public:
void GETDRINKS()
{
cin >> DCODE >> DNAME >> DSIZE >>DPRICE;
}
void SHOWDRINKS ()
{
cout<< DCODE << DNAME << DSIZE << DPRICE << endl;
}
char *GETNAME ()
{
return DNAME;
}
};

Question 5.
a) What is the need for normalization ? Define first, second and third normal forms.

Write SOL commands for (b) to (e) and write the outputs for (g) on the basis of table
CLUB.
TABLE : CLUB
Coach ID CoachNAME AGE SPORTS Dateofapp PAY SEX
1 KUKERJA 35 KARATE 27/03/1996 1000 M
2 RAVINA 34 KARATE 20/ 01/1998 1200 F
3 KARAN 34 SQUASH 19/02/1998 2000 M
4 TARUN 33 BASKETBALL 01/01/1998 1500 M
5 ZUBIN 36 SWIMMING 12/01/1998 750 M
6 KETAKI 36 SWIMMING 24/02/1998 800 F
7 ANKITA 39 SQUASH 20/02/1998 2200 F
8 ZAREEN 37 KARATE 22/02/1998 1100 F
9 KUSH 41 SWIMMING 13/01/1998 900 M
10 SHAILYA 37 BASKETBALL 19/02/1998 1700 M

(b) To show all information about the swimming coaches in the club.
(c) To list name of all coaches with their date of appointment (DATEOFAPP) in
descending order.
(d) To display a report, showing coachname, pay, age and bonus (15% of pay) for all the
coaches.
(e) To insert a new row in the CLUB table with the following data :

11, "PRAKASH", 37, "SQUASH", {25/02/98}, 2500, "M"
(f) Give the output of following SQL statements :
(i) SELECT COUNT (DISTINCT sports) FROM club;
(ii) SELECT MIN (age) FROM club WHERE sex = "F";
(iii)SELECT AVG(pay) FROM club WHERE sports ="KARATE";
(iv) SELECT SUM(pay) FROM club WHERE dateofapp > {31/01/98};
(g) Assume that there is one more table COACHES in the database as shown below:
TABLE:COACHES
SPORTS PERSON SEX COACH-NO
AJAY M 1
SEEMA F 2
VINOD M 1
TANEJA F 3

What will be the output of the following query :
SELECT sportsperson, coachname FROM club, coaches WHERE coach id = coach no;

Question 6.
(a) State Absorption Laws. Verify one of the Absorption Laws using truth tables.
(b) Prove X'.Y + Y’.Z = X'.Y.Z + X'.Y’.Z’ + XA" .Z + X'.Y'.Z algebraically.
(c) Obtain simplified form for a Boolean expression
F (x,y,z,w) = ∑(1,3, 4, 5, 7, 9,11, 12, 13, 15) using Karnaugh Map.
(d) Draw the logic circuit for a half adder.
(e) Represent the Boolean expression X’Y + Y’Z with the help of NAND gates only.
(f) Write the Sum of Products form of the function G(U,V,W), truth table representation
of G is as follows:

U V W G
0 0 0 0
0 0 1 0
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 0
1 1 0 0
1 1 1 1

Question 7.
(a) What are Routers ?
(b) What is the purpose of using a MODEM ?
(c) Write the two advantages and two disadvantages of Bus Topology in network.
(d) What is the difference between LAN and WAN ?

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Cbse question paper class_xii_paper_2000

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