(i) get single character using keyboard. This function is available in stdio.h. (ii) to check whether given character is alphabet or digit or not.

Size: px

Start display at page:

Download "(i) get single character using keyboard. This function is available in stdio.h. (ii) to check whether given character is alphabet or digit or not."

Pierce Wood
6 years ago
Views:

1 ES II 2017 Class : XII Set 1 Computer Science ( Answer Key) 1. (a) Write the significance of #include directive? Explain with example. 2 # include instructs the compiler which header file or user defined files has to be included in your program for feature use which are required for handling any of the functions or statements #include<iostream.h> #include any user defined file with detail path (b) Write the related library function based upon the given information in c++. (i) get single character using keyboard. This function is available in stdio.h. (ii) to check whether given character is alphabet or digit or not. (i) getchar() (ii) isalnum() (c ) Rewrite the following program after removing the syntactical errors (if any). Underline each correction.( assume all header files included) 2 #Define float Max=70.0; int speed char stop= N ; cin>>speed; if speed >Max stop= Y ; cout<<stop<<end; #define float Max 70.0 // error 1 int speed; // error 2 char stop= N ; cin>>speed; if (speed >Max) // error 3 stop= Y ; cout<<stop<<endl; // error 4 (d) Write the output of the following program (assume all header files included) 2 void position( int &c1, int c2=3) int y=5; c1+=2; c2+=y; int p1=20, p2=4; position(p1); ES2/ XII / Comp. Science/ Set 1 Page 1 of 23

2 cout<<p1<<, <<p2<<endl; position(p2,p1); cout<<p1<<, <<p2<<endl; 22, 4 22, 6 (e) Write the output of the following c++ code. 3 class calc char grade; int bonus; calc() grade= e ; bonus=0; void down( int g) grade -=g; void up( int g) grade +=g; bonus++; void show() cout<<grade<< # <<bonus<<endl; ; calc c; c.down(2); c.show(); c.up(7); c.show(); c.down(2); c.show(); c#0 j#1 h#1 (f) Look at the following C++ code and find possible output(s) from the options(i) to (iv) following it. Also write the maximum values that can be assigned to each of the variable N and M. 2 randomize(); int N=random(3), M=random(4); int DOCK[3][3] =1,2,3, 2,3,4, 3,4,5; for( int R=0; R<N; R++) ES2/ XII / Comp. Science/ Set 1 Page 2 of 23

3 for(int C=0; C<M; C++) cout<<dock[r][c]<< ; cout<<endl; Possible outputs (i) (iii) (ii) (iv) maximum value of N is 2 Maximum value of M is 3 Correct options: (ii) and (iii) 2.(a) Differentiate between public and private members of a class in the context of OOPs? Give a suitable example illustrating accessibility/non-accessibility of each using a class and object in C++. 2 Private public Implicit visibility mode Explicit visibility mode Not accessible to member functions of derived Accesible to member functions of derived class class as well as accessible to object of that class. class A int x; protected: int y; ; void z(); A obj; cin>>obj.x; obj.z(); //not accessible // accessible (b) Observe the following C++ code and answer the questions (i) and (ii). Assume all header files included. 2 ES2/ XII / Comp. Science/ Set 1 Page 3 of 23

4 class test long tcode; char ttitle[20]; float score; test() // function 1 tcode=100; strcpy(ttitle, exam series II ); score=0; test( test &t) // function 2 tcode= t.tcode +1; strcpy(ttitle, t.ttile); score=t.score; ; // statement 1 // statement 2 (i) which OOPs feature is illustrated by function 1 and function 2 together. What are they called. (ii) Write statement 1 and statement 2 to execute function 1 and function 2 respectively. (i) Polymorphism/constructor overloading/ function overloading (ii) test t1; // statement 1 test t2=t1; // statement 2 or test t2(t1); (c) Define a class RESTRA in C++ with the following descriptions: 4 Private members: fcode of type integer ( food code) ftype of type string ( food type) fname of type string ( food name) sticker of type string getsticker() which assigns the following values for sticker as per the given food type Ftype sticker Vegetarian green Contains egg yellow Non_vegeterian red Public members: Enter () to input the values for food code, food name, food type and call function getsticker() to assign sticker. Show () which displays the content of all the data members. ES2/ XII / Comp. Science/ Set 1 Page 4 of 23

5 class restra int fcode; ; char ftype[20], fname[20], sticker[15]; float getsticker(); void enter(); void show(); void restra::enter() cout<< enter food code ; cin>>fcode; cout<< enter food name ; gets(fname); cout<< food type ; gets(ftype); getsticker(); void restra::getsticker() if( strcmpi(ftype, vegeterian )==0) strcpy(sticker, green ); if( strcmpi(ftype, Non_vegeterian )==0) strcpy(sticker, red ); if( strcmpi(ftype, contains egg )==0) void restra::show() strcpy(sticker, yellow ); cout<< food code <<fcode; cout<< \nfood name <<fname; cout<< \nfood type <<ftype; cout<< \n Sticker <<sticker; (d) Answer the questions (i) to (iv) based on the following code: 4 class AC char Model[10]; char Date_of_purchase[10]; char Company[20]; AC( ); ES2/ XII / Comp. Science/ Set 1 Page 5 of 23

6 ; void entercardetail( ); void showcardetail( ); class Accessories : protected AC protected: ; float Price; Accessories( ); char Stabilizer[30]; char AC_cover[20]; void enteraccessoriesdetails( ); void showaccessoriesdetails( ); class Dealer : public Accessories int No_of_dealers; char dealers_name[20]; int No_of_products; Dealer( ); void enterdetails( ); void showdetails( ); ; (i) How many bytes will be required by an object of class Dealer and class Accessories? size of dealer: 118 Size of accessories: 94 (ii) Which type of inheritance is illustrated in the above C++ code? Write the base class and derived class name of class Accessories. Multilevel Base class for accessories class : AC Derived class for accessories class : Dealer (iii) Write names of all the members which are accessible from the objects of Dealer. Data members: price functions: enteraccessoriesdetails( ), showaccessoriesdetails( ), enterdetails( ), showdetails( ) (iv) Write names of all the members accessible from member functions of class Dealer. data members: Stabilizer, AC_cover, Price, No_of_dealers, dealers_name, No_of_products; Functions: entercardetail( ), showcardetail( ), enteraccessoriesdetails( ), showaccessoriesdetails( ), enterdetails( ), showdetails( ); ES2/ XII / Comp. Science/ Set 1 Page 6 of 23

7 3.(a) Find the output of the following C++ code considering that the binary file BOOK.DAT exists on the hard disk with a data of 200 books. 1 class book int bid; char bname[20]; void enter(); void display(); ; fstream infile; infile.open( book.dat, ios::binary ios::in); book b; infile.seekg(5 *sizeof(b)); infile.read((char *) &b, sizeof(b)); cout<< book number <<infile.tellg()/sizeof(b) +1; infile.seekg(0, ios::end); cout<< of <<infile.tellg()/sizeof(b)<<endl; infile.close(); Book Number : 7 of 200 (b) Write a function in C++ to count the words this and these present in a text file NOTES.TXT void count() 2 ifstream if1( notes.txt ); char word[10]; int ctr=0; while(!if1.eof()) // while(if1) if1>>word; if( strcmpi( word, this )==0 strcmpi( word, these )==0) ctr++; if1.close(); cout<< The number of this/these are <<ctr; (c ) Write a function in C++ to find the sum of all the digits present in a text file "PHONE.TXT". 2 void wordcount() ifstream if1( phone.txt ); char ch; int cnt=0; while(!if1.eof()) if1.get(ch); if( isdigit(ch)) cnt+=ch; // while(if1) ES2/ XII / Comp. Science/ Set 1 Page 7 of 23

8 cout<< Sum of digits <<cnt<<endl; if1.close(); (d) Consider the following class declaration: 3 class employee int code; ; char name[20]; float salary; void input() cin>>code>>name>>salary; void show() cout<<code<<name<<salary; float retsal() return salary ; (i) Write the objects of employee to a binary file. (ii) Read the objects of employee from the binary file and display all the objects on the screen whose salary is between Rs and Rs (i) void addition() ofstream of1; employee e; of1.open( emp.dat, ios::binary ios::app); char ch; do cout<< enter details of employee ; e.input(); of1.write((char *)&e, sizeof( e)); cout<< do u want to add more records ; cin>>ch; while( ch== y ch== y ); of1.close(); (ii) void display() ES2/ XII / Comp. Science/ Set 1 Page 8 of 23

9 ifstream if1; if1.open( emp.dat, ios::binary); employee e; while( if1.read((char *)&e, sizeof(e))) if( e.retsal()>=10000 && e.retsal()<=20000) e.show(); if1.close(); ( e) Given a binary file TRAIN.DAT, containing records of the following class train type. 3 class Train int train_no; char destination[40]; int distance; void read(); void display(); int retdist() return distance; //in km // accept all details // displays train_no, destination, distance ; Write a function in C++ that would read the contents of file TRAIN.DAT and display the details of those trains which travels the distance more than 1000 km. void displaytrain() ifstream if1; if1.open( TRAIN.DAT, ios::binary); Train T; while( if1.read((char *)&T, sizeof(t))) if( T.retdist()>1000) if1.close(); T.display(); ES2/ XII / Comp. Science/ Set 1 Page 9 of 23

10 Exam Series II 2017 Class XII Computer Science ( Marking Scheme) SET-II 1.(a) What is the significance of #define directive? Give suitable example for it. 2 (i) #define is used to define a constant #define Max 10 (ii) #define is used to define macro function also #define sqr(x) (x) * (x) (b) Write the related library function based upon the given information in c++. (i) get single character using keyboard but not displayed on monitor. (ii) to convert the character into uppercase 1 (i) getch() (ii) toupper() (c ) Rewrite the program after removing the syntax error. Underline each correction. 2 (assume all header files included) cout<< Enter an integer ; cin>>n; switch( N%2) case 0 cout<< Even ; Break; case 1 cout<< Odd ; Break; int N; //error 1 cout<< Enter an integer ; cin>>n; ES2/ XII / Comp. Science/ Set 1 Page 10 of 23

11 switch( N%2) //error 2(i) case 0: cout<< Even ; break; case 1: cout<< Odd ; break; //error 3(i) //error 4(i) //error 3(ii) //error 4(ii) //error 2(ii) (d) Find the output of the following program segment: 2 #define diff(n1,n2) ((n1>n2)? n1-n2: n2-n1) int a,b, num[]=10,23,14,54,32; for( int cnt=4; cnt>0; cnt--) a=num[cnt]; b=num[cnt-1]; cout<<diff(a,b)<< # ; 22#40#9#13# (e) Find Out the output for the program( Assume all header files included) 3 class train int tno, tripno, personcount; ES2/ XII / Comp. Science/ Set 1 Page 11 of 23

12 void init( int n=1) tno=n; tripno=0; personcount=0; void trip( int tc=100) tripno++; personcount +=tc; void show(), cout<<tno<< : <<tripno<< : <<personcount<<endl; - ; train T, N; T.init(10); N.init() ; N.trip(); T.show(); T.trip(70); N.trip(40); N.show(); T.show(); 10:0:0 1:2:140 10:1:70 (f) Look at the following c++ code and find possible output(s) from the options (i) to (iv) ES2/ XII / Comp. Science/ Set 1 Page 12 of 23

13 following it. Also write the maximum values tht can be assigned to each of the variable R and C. void 2 main() randomize(); int R=random(3), C=random(4); int MAT[3][3] =1,2,3, 2,3,4, 3,4,5; for( int i=0; i<r; i++) for(int j=0; j<c; j++) cout<<mat*i+*j+<< ; cout<<endl; Possible outputs (i) (ii) (iii) (iv) Correct option : (ii) and (iii) Maximum value of C = 3 Maximum value of R =2 ES2/ XII / Comp. Science/ Set 1 Page 13 of 23

14 2. a) Differentiate between protected and private members of a class in the context of OOPs? Give a suitable example illustrating accessibility/non-accessibility of each using a class and object in C++. 2 private Implicit visibility mode Not accessible to member functions of derived class protected Explicit visibility mode Accessible to member functions of derived class class A int x; protected: int y; void z(); ; (b) Aswer the questions (i) and (ii) after going through the class 2 class travel int placecode; char place[20]; float charges; travel() //function 1, placecode=1; strcpy(place, Delhi ); charges=1000; travel( int pc, char p[], float c) //function 2 ES2/ XII / Comp. Science/ Set 1 Page 14 of 23

15 placecode=pc; strcpy(place, p); charges=c; ~travel() //function 3, cout<< Travel plan cancelled ; - void travelplan( float c) //function 4, cout<< Place << : <<place<< : << Charges < : <<charges; - ; (i) What are function 1 and function 2 combined together referred as? (ii) Which concept is illustrated by function 3? When is this function invoked? (i) function overloading/ constructor overloading/ polymorphism (ii) Destructor. When the object will be out of scope, this function will be invoked. (c ) Define a class Clothing in C++ with the following descriptions: 4 Private Members: Code Type Size Material Price Calc_Price( ) of type string of type string of type integer of type string of type float // calculates and assigns the value of Price as follows: For the value of Material as COTTON : Type Price (Rs.) TROUSER 1500 SHIRT 1200 For Material other than COTTON the above mentioned Price gets reduced by 25%. Public Members: Enter( ) // input the values of Code, Type, Size and Material and invoke the CalcPrice( ) function. ES2/ XII / Comp. Science/ Set 1 Page 15 of 23

16 Show( ) //displays the content of all the data members class clothing char code[10], type[10],material[20]; int size; float price; void calc_price( ); void enter(); void show(); ; void clothing::enter() cout<< enter code ; cin>>code; cout<< enter type ; cin>>type; cout<< enter size ; cin>>size; cout<< enter material used ; cin>>material; calc_price(); void clothing ::calc_price() if( strcmpi( material, cotton )==0) if( strcmpi( type, trouser )==0) price=1500 if((strcmpi(type, shirt )==0) price=1200; ES2/ XII / Comp. Science/ Set 1 Page 16 of 23

17 else if( strcmpi( type, trouser )==0) price=1500 * 0.75; if((strcmpi(type, shirt )==0) price=1200 * 0.75; void clothing::show() cout<< code <<code; cout<< \ntype <<type; cout<< \nsize <<size; cout<< \nmaterial used <<material; cout<< \nprice <<price; (d) Give the following class definition answer the question that is follow: 4 class University char name [20]; protected : char vc[20]; public : void estd(); void inputdata(); void outputdata(); ; ES2/ XII / Comp. Science/ Set 1 Page 17 of 23

18 class College : protected University int regno; protected: char principal() public : int no_of_students; void readdata(); void dispdata ( ); ; class Department : public College char name[20]; char HOD[20]; public : void fetchdata(int); void displaydata( ); ; i). Name the base class and derived class of college. ii) Name the data member(s) that can be accessed from function displaydata(). iii)what type of inheritance is depicted in the above class definition? iv) What will be the size of an object (in bytes) of class Department? (i) base class : university and derived class : department (ii) name, HOD,vc, no_of_student (iii) multilevel (iv) 84 ES2/ XII / Comp. Science/ Set 1 Page 18 of 23

19 3.(a) Find the output of the following C++ code considering that the binary file clients.dat exist on the hard disk with records of 100 members. 1 class client int cno; char name[20]; void in(); void out(); ; fstream cf; cf.open( client.dat, ios::binary ios::in); client c; cf.read((char *) &c, sizeof(c )); cf.read((char *) &c, sizeof(c )); cf.read((char *) &c, sizeof(c )); int pos=cf.tellg()/sizeof(c ); cout<< present record <<pos<<endl; cf.close(); present record : 3 b) Write a function count() in c++ to count and display the presence of a separate word do in a text file student.dat. 2 void countd) ES2/ XII / Comp. Science/ Set 1 Page 19 of 23

20 int cnt=0; ifstream if1( student.dat ); char word[5]; while(! if1.eof()) if1>>word; if(strcmpi( word, do )==0) cnt ++; if1.close(); cout<< number of words do <<cnt; (c) Write a function in c++ to count and display the number of lines starting with alphabet text file lines.txt. 2 A present in a void countword() int cnt=0; ifstream if1( lines.txt ); char line[80]; while(! if1.eof()) if1.getline(line,80,. ); if( line[0]== A ) cnt ++; if1.close(); cout<< number of lines starting with A are <<cnt; (d) Given a binary file student.dat, containing records of the following class student type. 3 ES2/ XII / Comp. Science/ Set 1 Page 20 of 23

21 class student char s_admno[10]; // admission number of student char s_name[30]; //name of student int percentage; // percentage of student void enterdata() gets(s_admno); gets(name); cin>>percentage; void displaydata() cout<< setw(12)<<s_admno; cout<<setw(32)<<s_name; cout<<setw(5)<<percentage<<endl; ; int returnpercentage() return percentage; Write a function in c++ that would read contents of file student.dat and display the details of those students whose percentage is above 75. void displayrecord() student s; ifstream if1; if1.open( student.dat, ios::binary); while( if1.read((char *)&s, sizeof(s))) ES2/ XII / Comp. Science/ Set 1 Page 21 of 23

22 if( s.returnpercent()>=75) s.displaydata(); of1.colse(); ( e) Given a binary file DOCTOR.DAT containing records of the following class 3 class DOCTOR char name[20]; char add[20]; char area[20]; char phone[15]; void ledger(); void disp(); ; int checkcode(char ac[]) return strcmp(area,ac); Write a function SOUTHONLY() in c++, that would copy only those records having area as SOUTH from DOCTOR.DAT to SOUTH.DAT. void copyrecord() ifstream if1; if1.open( doctor.dat, ios::binary); ofstream of1; of1.open( south.dat, ios::binary); ES2/ XII / Comp. Science/ Set 1 Page 22 of 23

23 student s; while(if1.read((char *)&s, sizeof( s)) if( (s.checkcode( south )==0) of1.write((char *)&s, sizeof(s)); if1.colse(); of1.close(); ES2/ XII / Comp. Science/ Set 1 Page 23 of 23

KENDRIYA VIDAYALAYA PANGODE MONTHLY TEST AUGUST 2015

KENDRIYA VIDAYALAYA PANGODE MONTHLY TEST AUGUST 2015 CLASS: XII COMPUTER SCIENCE TIME: 1½ hrs TOTAL MARKS: 35 1. How can we make private members inheritable? (1) 2. Find out errors in the following program:-