Science (English Medium) Class 12 - CBSE Important Questions for Computer Science (C++)

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

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();
};

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

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:

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 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 :