Computer Science (C++) All India Set 4 2016-2017 Science (English Medium) Class 12 Question Paper Solution

Write the type of C++ tokens (keywords and user-defined identifiers) from the following:

1) new

2) While

3) case

4) Num_2

Anil typed the following C++ code and during compilation, he found three errors as follows :

1) Function strlen should have a prototype

2) Undefined symbol cout

3) Undefined symbol endl

On asking, his teacher told him to include necessary header files in the code. Write the names of the header files, which Anil needs to include, for successful compilation and execution of the following code:

void main()
{
    char Txt[] = "Welcome";
    for(int C= 0; C<strlen(Txt); C++)
       Txt[C] = Txt[C]+ 1;
    cout<<Txt<<endl;
}

Rewrite the following C++ code after removing any/all syntactical errors with each correction underlined.

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

void main()
{
     cout<<"Enter an Alphabet:" ;
     cin>>CB ;
     switch(CH)
     case 'A' · cout<<"Ant"; Break ;
     case 'B' · cout<<"Bear"; Break;
}

Find and write the output of the. following C++ program code

Note : Assume au· required header files are already included in the program.

#define Diff(N1,N2) ((N1>N2)?Nl-N2:N2-N1)
void main()
{
    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)<< '#';
    }
}

Find and write the output of the following C++ program code :
Note : Assume all required header files are already being included in the program.

void main()
{
     int *Point, Score[]={100,95,150 , 75 , 65, 120};
     Point = Score;
     for(int L = 0; L<6; L++)
     {
         if((*Poi nt)%10==0)
            *Point /= 2;
         else
            *Point -= 2;
         if((*Point) %5==0)
            *Point /= 5;
         Point++;
      }
      for(int L = 5; L>=O; L--)
          cout<<Score[L]<<"*";
}

Look at the following C++ code and find the possible output(s) from the options (i) to (iv) following it. Also, write the maximum values that can be assigned to each of the variables N and M

Note:

• Assume all the .required header files are already being included in the code.
• The function random(n) generates an integer between 0 and n-1

void main()
{
    randomize() ;
    int N=random(3), M=random(4);
    int DOCK[3][3] = {{1,2,3},{2,3,4}, {3,4,5}};
    for(int R=O; R<N; R++)
   {
       for(int C = 0; C< M; C++)
·        cout<<DOCK[R][C]<<" ";
       cout<<endl;
    }
}

1)
2)
3)
4)

Differentiate between protected .and private me~bers of a class. in context of Object Oriented Programming. Also, give a suitable example illustrating accessibility/non-accessibility of each using a class and an object in C++.

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

Note: Assume all necessary files are included

class TEST
{
    long TCode ;
    char TTitle[20];
    float Score;
public:
    TEST()      //Member Function 1
    {
         TCode=100;strcpy(TTit1e,"FIRST Test"); Score=O;
    };
    TEST(TEST &T)    //Member Function 2
    {
         TCode=E.TCode+1;
         strcpy(TTitle , T.TTitle);
         Score=T.Score;
     }
};

void main()
{
   __________    //Statement 1
   __________    //Statement 2
}

1) Which Object-Oriented Programming feature is illustrated by the Member Function 1 and the Member Function 2 together in the class TEST?

2) Write Statement 1 and Statement 2 to execute Member Function 1 and Member Function 2 respectively.

Write the definition of a class BOX 1n C++ with the following description

Private Members

- BoxNumber //data member of integer type

- Side           // data member of float type

- Area          // data member of float type

- ExecArea ()  // Member function to calculate and assign Area as Side * Side

Public Members

- GetBox()   // function to allow user to enter values of BoxNumber and Side. Also, this

                  // function should call ExecArea () to calculate Area

- Showbox ()  //  A function to display BoxNumber , Side and Area

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

class First
{
    int X1;
protected:
    float X2;
public:
    First();
    void Enter1(); void Display1;
};

class Second: private First
{
    int Y1;
protected:
    float Y2;
public:
    Second();
    void Enter2();
    void Display();
};

class Third : public Second
{
    int Z1;
public:
    Third{);
    void Enter3();
    void Display{);
};

void main()
{
    Third T;  //Statement 1·
    __________;  // Statement 2
}

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

Single Level Inheritance, Multilevel Inheritance, Multiple Inheritance

2) Write the names of all the member functions, which are directly accessible by the object T of class Third as declared in main() function.

3) Write Statement 2 to call function Display() of class Second from the object T of class Third

4) What will be the order of execution of the constructors, when the object T of class Third is declared inside main()?

Write the definition of a function AddUp(int Arr[], int N) in C++, in which all even positions (i.e., 0,2,4, ... ) of the array should be added with the content of the element in the next position and odd positions (i.e., 1,3,5, ... ) elements should be incremented by 10

Example: if the array Arr contains

Then the array should become

Note:

• The function should only alter the content in the same array.
• The function should not copy the altered content in another array.
• The function should not display the altered content of the array.
• Assuming, the Number of elements in the array are Even.

Write a definition for a function SUMMIDCOL(int MATRIX [10], int N, int M) in C++, which finds the sum of the middle column's elements of the MATRIX (Assuming N represents a number of rows and M represents the number of columns, which is an odd integer). 
Example: If the content of array MATRIX having N as 5 and M as 3 is as follows

The function should calculate the sum and display the following :

Sum of Middle Column: 15

ARR[15] ft:20] is a two-dimensional array, which is stored in the memory along the row with each of its elements occupying 4 .bytes. Find the .address of the element ARR[5)[15], if the element ARR[lO] [5] is stored at the memory location 35000.

Write the definition of a member function PUSHGIFT() for a class STACK in C++, to add a GIFT in a dynamically allocated stack of GIFTs considering the following code is already written as a part of the program

struct GIFT
{
    int GCODE;           //Gift Code
    char GDESC[20];      //Gift Description
    GIFT *Link;
};
class STACK
{
    Gift *TOP;
public:
    STACK(){TOP=NULL;}
    void PUSHGIFT{);
    void POPGIFT();
    ~STACK();
};

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

X-( Y+Z )/U * V

Polina Raj has used a text editing software to type some text in an article. After saving the article as MYNOTES.TXT, she realised that she has wrongly typed alphabet K in place of alphabet C everywhere in the article.

Write a function definition for PURETEXT() in C++ that would display the corrected version of the entire article of the file MYNOTES.TXT with all the alphabets "K" to be displayed as an alphabet "C" on screen.

Note: Assuming that MYNOTES.TXT does not contain any c alphabet otherwise

Example:

If Polina has stored the following content in the file MYNOTES.TXT

The function PURETEXT() should display the following content

Write a definition for function COUNTPICS() in C++ to read each object of a binary file PHOTOS.DAT, find and display the total number of PHOTOS of type PORTRAIT. Assume that the file PHOTOS.DAT is created with the help of objects of class PHOTOS, which is defined below :

class PHOTOS
{
   int PCODE ;
   char PTYPE[20]; //Photo Type as "PORTRAIT" ,"NATURE"
public:
   void ENTER()
   {
       cin>>PCODE;gets(PTYPE);
   }
   void SHOWCASE()
   {
       cout<<PCODE<<":" <<PTYPE<<endl;
   }
   char *GETPTYPE(){return PTYPE;}
};

Find the output of the following C++ code considering that the binary file CLIENTS.DAT exists on the hard disk with a data of 200 clients:

class CLIENTS
{
    int CCode; char CName[20];
public:
    void REGISTER(); void DISPLAY();
};

void main()
{
    £stream File;
    File.open("CLIENTS.DAT", ios::binary|ios::in);
    CLIENTS C;
    File.seekg(6*sizeof(C));
    File.read((char*)&C, sizeof(C));
    cout<<"Client Number: "<<File.tellg()/sizeof(C) + 1;
    File.seekg(0 , ios :: end) ;
    cout<<"of"<<File.tellg(}/sizeof(C)<<endl;
    File.close();
}

Observe the following table MEMBER carefully and write the name of the RDBMS operation out of (i) SELECTION (ii) PROJECTION (iii) UNION (iv) CARTESIAN PRODUCT, which has been used to produce the output as shown in RESULT. Also, find the Degree and Cardinality of the RESULT :

MEMBER

RESULT

Write SQL queries for (i) to (iv) and find outputs for SQL queries (v) to (viii), which are based on the tables.

DVD

MEMBER

1) To display all details from the table MEMBER in descending order of ISSUEDATE

2) To display the DCODE and DTITLE of all Folk Type DVDs from the table DVD.

3) To display the DTYPE and number of DVDs in each DTYPE from the table DVD.

4) To display all NAME and ISSUEDATE of those members from the table. MEMBER who have DVDs issued (i.e., ISSUEDATE) in the year 2017

5) SELECT MIN(ISSUEDATE) FROM MEMBER

6) SELECT DISTINCT DTYPE FROM DVD;

7) SELECT D.DCODE, NAME, DTITLE FROM DVD D, MEMBER M WHERE D.DCODE=M.DCODE;

8) SELECT DTITLE FROM DVD WHERE DTYPE NOT IN ("Folk", "Classical" ) ;

State DeMorgan's Laws of Boolean Algebra and verify them using a truth table.

Draw the Logic Circuit of the following Boolean Expression using only NOR Gates

(A+B).(C+D)

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

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

`E (U, V, Z, W) = sum (2, 3 , 6, 8, 9, 10, 11 , 12 , 13 )`

Differentiate between communication using Optical Fiber and Ethernet Cable in context of the wired medium of communication technologies.

Janish Khanna used a pen drive to copy files from his friend's laptop to his office computer. Soon his computer started abnormal functioning. Sometimes it would restart by itself and sometimes it would stop different applications running on it. Which of the following options out ·of (i) to (iv), would have caused the malfunctioning of the computer? Justify the reason for your chosen option:

1) Computer Virus

2)Spain Mail

3) Computer Bacteria

4) Trojan Horse

Ms Raveena Sen is an IT expert and a freelancer. She recently used her skills to access the Admin password for the network server of Super Dooper Technology Ltd. and provided confidential data of the organization to its CEO, informing him about the vulnerability of their network security. Out of the following options (i) to (iv), which one most appropriately defines Ms Sen?

Justify the reason for your chosen option :
1) Hacker

2) Cracker

3) Operator

4) Network Admin

Hi-Standard Tech Traj.ning Ltd. is a Mumbai based organization which is expanding its office set-up to Chennai. At Chennai office compound, they are planning to have 3 different blocks for Admin, Training and Accounts related activities. Each block has a number of computers, which are required to be connected in a network for communication, data and resource sharing.

As a network consultant, you have to suggest the best network related solutions for them for issues/problems raised by them in (i) to (iv), as per the distances between various blocks/locations and other given parameters.

Shortest differences between various blocks/locations:

The number of computers installed at various blocks is as follows:

1) Suggest the most appropriate block/location to house the SERVER in the CHENNAI office (out of the 3 blocks) to get the best and effective connectivity. Justify your answer.

2) Suggest the best-wired medium and draw the cable layout (Block to Block) to efficiently connect various blocks within the CHENNAI office compound.

3) Suggest a device/software and its placement that would provide data security for the entire network of the CHENNAI office.

4) Suggest a device and the protocol that shall be needed to provide wireless Internet access to all smartphone/laptop users in the CHENNAI office