Computer Science (C++) All India Set 4 2014-2015 Science (English Medium) Class 12 Question Paper Solution

Find the correct identifiers out of the following, which can be used for naming Variable, Constants or Functions in a C++ program.

For, while, INT, NeW, delete, lstName, Add+Subtract, namel

Observe the following program very carefully and write the names of those header files (s), which are essentially needed to compile and execute the following program successfully :

typedef char STRING[80];
void main()
{
    STRING Txt[] ="We love Peace";
    int Count=O;
    while(Txt[Count]!='\0')
    if (isalpha(Txt[Count]))
       Txt[Count++]='@';
    else
       Txt[Count++]='#';
    puts(Txt);
}

Observe the following C++ code very carefully and rewrite it after removing any/all syntactical errors with each correction underlined.

Note: Assume all required header files are already being included in the program

#Define float MaxSpeed=60.5;
void main()
{
   int MySpeed
   char Alert='N';
   cin>>MySpeed;
   if MySpeed>MaxSpeed
    Alert='Y';
    cout<<A1ert<<endline;
}

Write the output of the following C++ program code :

Note: Assume all required header files are already being included in the program.

void Location(int &X,int Y=4)
{
   Y+=2;
   X+=Y;
}
void main()
{
   int PX=l0,PY=2;
   Location(PY);
   cout<<PX<<","<<PY<<endl;
   Location(PX,PY);
   cout<<PX<<", "<<PY<<endl;
}

Write the output of the following C++ program code:

Note: Assume all required header files are already being included in the program.

class Eval
{
   char Level;
   int Point;
public:
   Eval(){Level='E'; Point=O;}
   void Sink(int L)
   {
      Level~=L;
   }
   void Float(int L)
   {
      Level+=L;
      Point++;
   }
   void Show()
   {
      cout<<Level<<"#"<<Point<<endl;
   }
};

void main ()
{
   Eval E;
   E.Sink(3);
   E.Show();
   E.Float(7);
   E.Show();
   E.Sink(2);
   E.Show();
}

Study the following program and select the possible output(s) from the options (i) to (iv) following it. Also; write the maximum and the minimum values that, can be ·assigned to the variable VAL

Note:

-Assume all required header files are already being included in the program.

- random(n) function generates all integer 6, and n-1.

void main ()
{
   randomize();
   int VAL;
   VAL=random(3)+2;
   char GUESS[] ="ABCDEFGHIJK";
   for(int I = 1, I = 1;I <= VAL; I++)
   {
      for (int J=VAL; J<= 7; J++)
      cout<<GUESS[J];
      cout<<endl;
   }
}

1) 

2)

3)

4)

What is a copy constructor? 

Give a suitable example in C++ to illustrate with its definition within a class and a declaration of an object with the help of it.

Observe the following C++ code and answer the questions (i) and (ii):

class Passenger
{
   long PNR;
   char Name[20];
public:
   Passenger () · //Function 1
   { cout<<"Ready"<<endl; }

   void Book(long P,char N[]) //Function 2
   { PNR = P; strcpy(Name, N);}

   void Print () //Function 3
   { cout«PNR << Name <<endl; }
   
   -Passenger() //Function 4
   { cout<<"Booking cancelled! "<<endl;}
};

1) Fill in the blank statements in Line 1 and Line 2 to execute Function 2 and Function 3 respectively in the following code:

void main()
{
   Passenger P;
   _________      //Line 1
   _________      //Line 2
}//Ends here

2) Which function will be executed at } // Ends here? What is this function referred as?

Write the definition of a class Photo In C++ with the following description:

Private Members

- Pno    //Data member for Photo Number (an integer)

-Category //Data.member for Photo Category (a string)

- Exhibit I // Data member for Exhibition Gallery (a string) 

- FixExhibit //A member function to assign Exhibition Gallery as per Category as shown in the following table

Public Members

-Register()   //A function to allow user to enter values Pno I category and call FixExhibi t () function

- ViewAll()  //A function to display all the data members

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

class Interior
{
    int Orderid;
    char Address[20];
protected:
   float Advance;
public:
   Interior();
   void Book(); void View();
};

class Painting:public Interior
{
    int Wall,Area,ColorCode;
protected:
    char Type;
public:
   Painting();
   void PBook();
   void PView();
};

class Billing : public Painting
{
   float Charges;
   void Calculate();
public:
   Billing();
   void Bill();
   void BillPrint();
};

1) Which type of Inheritance out of the following is illustrated in the above example?

• Single Level Inheritance
• Multi-Level Inheritance
• Multiple Inheritance

2) Write the names of all the data members, which are directly accessible from the member functions of class Painting.

3) Write the names of all the member functions, which are directly accessible from an object of class Billing.

4) What will be the order of execution of the constructors, when an object of class Billing is declared?

Write the definition of a function Change(int P[], int N) in C++, which should change all the multiples of 10 in the array to 10 and rest of the elements as 1. For example, if an array of 10 integers is as follows:

After executing the function, the array content should be changed as follows:

A two-dimensional array ARR[50][20] is stored in the memory along the row with each of its elements occupying 4 bytes. Find the address of the element ARR[30] [10], if the element ARR[10] [5] is stored at the memory location 15000.

Write the definition of a member function PUSH( ) in C++, to add a new book in a dynamic stack of BOOKS considering the following code is already included in the program

struct BOOKS
{
   char ISBN[20], TITLE[80];
   BOOKS *Link;
};
class STACK
{
   BOOKS *Top;
public:
   STACK-() {Top=NULL;}
   void PUSH();
   void POP();
   ~STACK();
};

Write a function REVROW(int P[] [5], int N, int M) in C++ to display the content of a two-dimensional array, with each row content in reverse order.

For example, if the content of the array is as follows:

The function should display output as

Convert the following Infix expression to its equivalent Postfix expression, showing the stack contents for each step of conversion

U * V + R/(S - T)

Write function definition for TOWER() in C++ to read the content of a text file WRITEUP.TXT, count the presence of word TOWER and display the number of occurrences of this word.

Note:

•  The word TOWER should be an independent word
• Ignore type cases (i.e. lower/upper case)

Example:

If the content of the file WRITEUP.TXT is as follows:

The function TOWER( ) should display the following :

Write a definition for function COSTLY() in C++ to read each record of a binary file GIFTS.DAT, find and display those items, which are priced more than 2000. Assume that the file GIFTS.DAT is created with the help of objects of class GIFTS, which is defined below

c1ass GIFTS
{
   int CODE; char ITEM[20]; f1oat PRICE;
pub1ic:
   void Procure()
  {
       cin>>CODE; gets (ITEM);cin>>PRICE;
  }
  void View()
  {
      cout<<CODE<<":"<<ITEM<<":"<<PRICE<<end1;
  }
  f1oat GetPrice () {return PRICE;}
};

Find the output of the following C++ code considering that the binary file MEMBER.DAT exists on the hard disk with records of 100 members :

c1ass MEMBER
{
  int Mno; char Name[20];
pub1ic:
  void In();void Out();
};

void main()
{
  fstream MF;
  MF.open("MEMBER. DAT" , ios::binary|ios::in);,

  MEMBER M;
  MF.read((char*)&M, sizeof(M));
  MF. read( (char*) &M, sizeof (M));
  MF. read ((char*) &M, si:zeof (M));
  int POSITION= MF. te11g 0 / sizeof (M);
  cout<<"PRESENT RECORD:"<<POSITION<<end1;
  MF.c1ose();
}

Observe the following table carefully and· write the names of the most appropriate columns, which can be considered as (i) candidate keys and. (ii) primary key:

Consider the following DEPT and EMPLOYEE tables. Write SQL queries for (i) to (iv) and find outputs for SQL queries (v) to (viii).

Table: DEPT

Table: EMPLOYEE

Note: DOJ refers to the date of joining ·and DOB refers to the date of Birth of employees

1) To display Eno, Name, Gender from the table EMPLOYEE in ascending order of Eno.

2) To display the Name of all the MALE Employees from the table EMPLOYEE.

3) To display the Eno and Name of those employees from the table EMPLOYEE who are born between '1987-01-01' and '1991-12-01'.

4) To count and display FEMALE employees who have Joined after '1986-01-01'.

5) SELECT COUNT(*), DCODE FROM EMPLOYEE GROUP BY DCODE HAVING COUNT(*)>1;

6) SELECT DISTINCT DEPARTMENT FROM DEPT;

7) SELECT NAME, DEPARTMENT FROM EMPLOYEE E, DEPT D WHERE E.DCODE=D.DCODE AND EN0<1003;

8) SELECT MAX(DOJ), MIN(DOB) FROM EMPLOYEE;

Verify the following using Boolean Laws : U'+V = U'V'+ U' .V + U.V

Draw the Logic Circuit for the following Boolean Expression: (X'+Y).Z + W'

Derive a Canonical POS expression for a Boolean function F, represented by the following truth table

Reduce the following Boolean Expression to its simplest form using K-Map

`F (X, Y, Z, W) = sum (0, 1, 4, 5, 6, 7, 8, 9, 11, 15)`

illustrate the layout for connecting 5 computers in a Bus topology of Networks

illustrate the layout for connecting 5 computers in a star topology of Networks

What kind of data gets stored in cookies and how is it useful ?

Differentiate between packet switching over message switching

Out of the following, which is the fastest (i) wired and (ii) Wireless meium of communication ?

·Infrared, Coaxial Gable, Ethernet Cable, Microwave, Optical Fiber

What is Trojan Horse?

Out of the following, which all comes under cyber crime ?

1) Stealing away a brand new hard disk from a showroom

2) Getting in someone's social networking account without his consent and posting on his behalf

3) Secretly copying data from server of an organization and selling it to the other organization.

4) Looking at online activities of a friends blog.

Xcelencia Edu Services Ltd. is an educational organization. It is planning to set up its India campus at Hyderabad with its head office at Delhi. The Hyderabad campus has 4 main
buildings ADMIN, SCIENCE, BUSINESS and ARTS.

You as a network expert have to suggest the best network related . solutions for their problems raised in (i) to (iv), keeping in mind the distances between the buildings and other given parameters.

Shortest distances between various buildings :

Number of computers installed at various buildings are as follows :

1) Suggest the most appropriate location of the server inside the HYDERABAD campus (out of the 4 buildingakto get the best connectivity for maximum number of computers. Justify your answer

2) Suggest . and draw the cable layout to efficiently connect various buildings within the HYDERABAD campus for connecting the computers.

3) Which hardware device will you suggest to be procured by the company to be installed to protect and control the internet uses within the campus?

4) Which of the following will you suggest to establish the online face-to-face communication between the people in the Admin Office of HYDERABAD campus and · DELHI Head Office ?

• E-mail
• Text Chat
• Video Conferencing
• Cable TV