KENDRIYA VIDYALAYA SANGATHAN TINSUKIA REGION PRE BOARD EXAMINATION SUBJECT COMPUTER SCIENCE
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1 CLASS- XII MAX MARKS-70 KENDRIYA VIDYALAYA SANGATHAN TINSUKIA REGION PRE BOARD EXAMINATION SUBJECT COMPUTER SCIENCE TIME- HOURS Q1 a) What is the Difference between Global Variable and Local Variable? Also give a suitable C++ code to illustrate both. b) Name the Header files to which following function belong. (i) islower() (ii) gets() c) Rewrite the following program after removing the syntactical error(s) if any #include<iostream.h> const int size 10; void main() int Arr[size]; Arr=1,,,,5,6,7,8,9,10; for(ctr=0; ctr<size; ctr++) cout>>arr[ctr]; d) 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. void main() int Guess,n; randomize(); cin>>guess; for(int i=1; i<=; i++) n=guess+random(i); cout<<(char)n; (1) ABBC () ACBA () BCDA () CABD e) Find the output of the following program. void secret (char str[ ]) for (int L=0; str[l]!='\0'; L++) for (int C=0; C<L/; C++) if (str[c] =='A' str[c] =='E') str[c]='#'; else char tmp=str[c]; str[c]=str[l-c-1]; str[l-c-1]= tmp; void main() char Message[ ]="ArabSagar"; secret(message); cout<<message; 1 Page 1
2 f) Find the output. void prnseries() static int start=10; int i=0,c; for( ;i<; i++) c=start/; cout<<endl<<start <<"\t"<<c; start+=0; void main() int i=; for(int j=0; j<i; j++) prnseries(); Q a) Differentiate between Constructor and Destructor function with respect to Object Oriented Programming. b) Answer the questions (i) and (ii) after going through the following program: class Match int Time; Match() //Function 1 Time=0; cout<< Match commences <<end1; void Details() //Function cout<< Inter Section Basketball Match <<end1; Match(int Duration) //Function Time=Duration; cout<< Another Match begins now <<end1; Match(Match &M) //Function Time=M.Duration; cout<< Like Previous Match <<end1; ; i) Which category of constructor - Function belongs to and what is the purpose of using it? ii) Write statements that would call the member Functions 1 and c) Define a class Travel in C++ with the description given below. Private members plancode of type long place of type character array number_of_travellers of type integer number_of_buses of type integer Public members A constructor to assign initial value of plancode as 1001, place as KOLKATA, number_of_travellers as 5 and number_of_buses as 1. Page
3 A function newplan() which allows user to enter plancode, place and number_of_travellers and also assign the number_of_buses as per the following conditions. Number_of_travellers number_of_buses Less than 0 Equal to and more than 0 and less than 0 Equal to and more than 0 A function show() to display the contents of all the data members. d) Answer the question (I) to (VI) based on the following code. class Book char Title[0]; char Author[0]; int no_of_pages; void read(); void show(); ; class Textbook: private Book int no_of_chapters, no_of_assignments; protected: int standard; void readtextbook(); void showtextbook(); ; class physicsbook : public Textbook char Topic[0]; void readphysicsbook(); void showphysicsbook(); ; (i) What will be the size of an object of class physicsbook? (ii) Name the members which can be accessed from the member function of class physicsbook. (iii) Name the members which can be accessed by an object of class Textbook. (iv) Name the date member which can be accessed by function readtextbook. a) write a function in C++ which accepts an integer array and its size as parameters and shifts all the negative numbers to left. Example: if an array initially contain the elements as,-,5,-1,6,7,-8,1,-10 then the function should rearrange the array as -,-1,-8,-10,,5,6,7,1 Page
4 b) Given two arrays of integer X and Y of size M and N respectively. Write a Function named Merge() which will produce a third array names Z, such that the following sequence is followed. (i) All Odd numbers of X from left to right are copied into Z from left to right. (ii) All Even numbers of X from left to right are copied into Z from right to left. (iii) All Odd numbers of Y from left to right are copied into Z from left to right. (iv) All Even numbers of Y from left to right are copied into Z from right to left. c) An Array A[5][15] is stored in the memory along the row with each of its element occupying bytes. Find out the base address and the address of an element A[0][15], if the location A[][] is stored at the address 000. d) Each node of a STACK contains the following information, in addition to required pointer field: i) Roll number of the student ii) Age of the student Give the structure of node for the linked STACK in question. TOP is a pointer points to the topmost node into the STACK. Write the following Function: i) PUSH( )- To push a node into stack, which is allocated dynamically. ii) POP( ) To remove a node from the stack, and released the memory. e) Evaluate the following postfix notation of expression. 0, 0, +, 50, 0, -,* a) Observe the programme segment given below carefully and the questions that follow. class stock int ino,qty; char item[0]; void enter() cin>>ino; Gets(item); Cin>>qty; void issue (int x) qty+=x; void purchase(int x) qty -=x; int getino() return ino; ; 1 Page
5 void purchaseitem() int pion; fstream file; file.open( stock.dat,ios::binary); stock S; int success=0; cout<< Enter Pion ; cin>>pion; while(success==0 && file.read((char*)&s, sizeof(s))) if (pion==s.getino()) S.purchase(pqty); //statement 1 // statement success ++; if(success==1) cout<< Purchase updated ; else cout<< wrong item no : file.close(); 1) Write statement 1 to position the file pointer to the appropriate place, so that the data updation is done for the required item. ) Write statement to perform the write operation so that the updation is done in the binary file. b) Assume that a text file named FILE.TXT already contains some text written into it. But while writing into the file, the word, when has been misspelled whn everywhere in the file. Write a function named Corrections ( ) in C++ that reads the file FILE.TXT. and corrects the word whn. c) Given a binary file student.dat containing records of the following class student type. class student char admn[0]; char name[0]; int percentage; void enterdata(); void display(); int R_percentage() return percentage; ; Write a Function in C++ that would read contents of file student.dat and display the details of those records whose percentage is above a) What do you understand by the following in a relation database : i) Candidate Key ii) Project Operation. b) Consider the following tables. (1) Write SQL commands for the statements (i) to (iv) () give outputs for SQL queries (v) to (viii) + Page 5
6 Table: PRODUCT P-ID PRODUCTNAME MANUFACTURER PRICE TP01 Talcom Powder LAK 0 FW05 Face Wash ABC 5 BS01 Bath soap ABC 55 SH06 Shampoo XYZ 10 FW1 Face Wash XYZ 95 Table: CLIENT C_ID CLIENTNAME P_ID CITY 01 Cosmetic Soap FW05 Delhi 06 Total Health BS01 Mumbai 1 Live life SH06 Delhi 15 Pretty Woman FW1 Delhi 16 Dreams TP01 Banglore (i) To display the details of those clients whose city is Delhi. (ii) To display the details of the Products whose price is in the range of 50 to 100 (Both values included) (iii) To display the Clientname, city from table client and Productname and price from table product, with their corresponding matching P_ID. (iv) To increase the price of all products by 10. (v) SELECT Distinct City from client; (vi) SELECT Manufacturer,Max(price),Min(price),count(*) from product group by manufacturer. (vii) SELECT clientname, manufacturer from product, client where client.p_id=product.p_id; (viii) SELECT productname,price* from product; 6 a) Write a function in C++ to count the number of lines started by the vowel characters in a binary file Friends.dat b) Define a class clothing in C++ with following description: private member code of type string type of type string size of type integer material of type string price of type float a member function calc_price() which calculates and assign the value of price as follows: for the value of material as COTTON : Type Price(Rs.) TROUSER 1500 SHIRT 100 FOR material other than COTTON the above mentioned price get reduced by 5%. public members A constructor to assign initial values of code,type and material with the word NOT ASSIGNED and size and price with 0. A function Enter() to input values of the data members code,type,size and material and invoke the calc_price function. A function show() which display the content of all the data members for a clothing. Page 6
7 c) write a function in C++ which accepts an integer array and its size as parameters and rearrange the array in reverse. Example: if an array of nine elements initially contain the elements as,,5,1,6,7,8,1,10 then the function should rearrange the array as 10,1,8,7,6,1,5,, 7 a) Observe the following program Game.cpp carefully, if the value of Num entered by user is 1, choose the correct possible output(s) from the option i) to iv) and justify your option. //Program:: Game.cpp #include<iostream.h> #include<stdlib.h> void main( ) randomize( ); int Num, Rndnum; cin>>num; Rndnum=random(Num)+1; for(int N=1;N<=Rndnum;N++) cout<<n<< ; Output options: i) 1 ii) iii) 1 59 iv) none of the above b) What is function Overloading?. 1 c) Answer the question i) to iv) based on the following: class CUSTOMER int Cust_no; char Cust_name[0]; protected: void Register( ); CUSTOMER( ); void Status( ); ; class SALESMAN int Salesman_no; char Salesman_name[0]; protected: float Salary; SALESMAN( ); void Enter( ); void Show( ); ; Page 7
8 class SHOP: private CUSTOMER, public SALESMAN char Voucher_No[10]; char Sales_Date[8]; public SHOP( ); void Sales_Entry( ); void Sales_Detail( ); ; i) Write the names of data members which are accessible from objects belonging to class CUSTOMER. ii) Write the names of all the members function which are accessible from objects belonging to class SALESAMAN. iii) Write the names of all the members which are accessible from objects belonging to class SHOP. iv) How many bytes will be required by an object belonging to class SHOP? d) Convert the following infix expression into postfix expression using stack and show the status of the stack after every step: (((A+B)-C)*(D-E)) Page 8
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