Solved Final Paper 2009 CS304- Object Oriented Programming

FINALTERM  EXAMINATION

Fall 2009

CS304- Object Oriented Programming (Session - 4)

Time: 120 min

Marks: 75

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Question No: 1    ( Marks: 1 )    - Please choose one

 A template provides a convenient way to make a family of

       ► variables and data members

       ► functions and classes

       ► classes and exceptions

       ► programs and algorithms

   

Question No: 2    ( Marks: 1 )    - Please choose one

 Which one of the following terms must relate to polymorphism?

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       ► Static allocation

       ► Static typing

       ► Dynamic binding

       ► Dynamic allocation

   

Question No: 3    ( Marks: 1 )    - Please choose one

 What is true about function templates?

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       ► The compiler generates only one copy of the function template

       ► The compiler generates a copy of function respective to each type of data

       ► The compiler can only generate copy for the int type data

       ► None of the given.

   

Question No: 4    ( Marks: 1 )    - Please choose one

 Which of the following is the best approach if it is required to have more than one functions having exactly same functionality and implemented on different data types?

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       ► Templates

       ► Overloading

       ► Data hiding

       ► Encapsulation

   

Question No: 5    ( Marks: 1 )    - Please choose one

 template <>

class Vector<char*> { }

This is an example of partial specialization.

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       ► True

       ► False

   

Question No: 6    ( Marks: 1 )    - Please choose one

 Classes like TwoDimensionalShape and ThreeDimensionalShape would normally be concrete, while classes like Sphere and Cube would normally be abstract.

       ► True

       ► False

   

Question No: 7    ( Marks: 1 )    - Please choose one

 A non-virtual member function is defined in a base class and overridden in a derived class; if that function is called through a base-class pointer to a derived class object, the derived-class version is used.

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       ► True

       ► False

   

Question No: 8    ( Marks: 1 )    - Please choose one

 Assume a class Derv that is privately derived from class Base. An object of class Derv located in main() can access

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       ► public members of Derv.

       ► protected members of Derv.

       ► private members of Derv.

       ► protected members of Base.

   

Question No: 9    ( Marks: 1 )    - Please choose one

 In order to define a class template, the first line of definition must be:

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       ► template <typename T>

       ► typename <template T>

       ► Template Class <ClassName>

       ► Class <Template T>

   

Question No: 10    ( Marks: 1 )    - Please choose one

 If there is a pointer p to objects of a base class, and it contains the address of an object of a derived class, and both classes contain a nonvirtual member function, ding(), then the statement p->ding(); will cause the version of ding() in the _____ class to be executed.

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       ► Base

       ► Derived

       ► Abstract

       ► virtual

   

Question No: 11    ( Marks: 1 )    - Please choose one

 When the base class and the derived class have a member function with the same name, you must be more specific which function you want to call (using ___________).

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       ► scope resolution operator

       ► dot operator

       ► null operator

       ► Operator overloading

   

Question No: 12    ( Marks: 1 )    - Please choose one

 Non Template Friend functions of a class are friends of ________instance/s of that class.

       ► All

       ► One specific

       ► All instances of one date type

       ► None of the given options

   

Question No: 13    ( Marks: 1 )    - Please choose one

 The find() algorithm

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       ► finds matching sequences of elements in two containers.

       ► finds a container that matches a specified container.

       ► takes iterators as its first two arguments.

       ► takes container elements as its first two arguments.

   

Question No: 14    ( Marks: 1 )    - Please choose one

 If you define a vector v with the default constructor, and define another vector w with a one-argument constructor to a size of 11, and insert 3 elements into each of these vectors with push_back(), then the size() member function will return ______ for v and _____ for w.

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      ►  11 for v and 3 for w.

       ► 0 for v and 0 for w.

       ► 0 for v and 3 for w.

       ►  3 for v and 11 for w.

   

Question No: 15    ( Marks: 1 )    - Please choose one

 Which of the following may not be an integral part of an object?

       ► State

       ► Behavior

       ► Protected data members

       ► All of given

   

Question No: 16    ( Marks: 1 )    - Please choose one

 Which is not the Advantage of inheritance?

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       ► providing class growth through natural selection.

       ► facilitating class libraries.

       ► avoiding the rewriting of code.

       ► providing a useful conceptual framework.

   

Question No: 17    ( Marks: 1 )    - Please choose one

 class DocElement

{

public:

      virtual void Print() { cout << "Generic element"; }

};

class Heading : public DocElement

{

public:

      void Print() { cout << "Heading element"; }

};

class Paragraph : public DocElement

{

public:

      void Print() { cout << "Paragraph element"; }

};

void main()

{

      DocElement * p = new Paragraph();

      p->Print();

}

When you run this program, it will print out a single line to the console output.

What will be in that line?

Select one correct answer from the following list:

       ► Generic element

       ► Heading element

       ► Paragraph element

       ► Nothing will be printed.

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Question No: 18    ( Marks: 1 )    - Please choose one

 When a virtual function is called by referencing a specific object by name and using the dot member selection operator (e.g., squareObject.draw()), the reference is resolved at compile time.

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       ► True              

       ► False

   

Question No: 19    ( Marks: 1 )    - Please choose one

 In case of multiple inheritance a derived class inherits,

       ► Only the public member functions of its base classes

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       ► Only the public data members of its base classes

       ► Both public data members and member functions of all its base classes

       ► Data members and member functions of any two base classes

   

Question No: 20    ( Marks: 1 )    - Please choose one

 When we write a class template the first line must be:

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       ► template < class class_name>

       ► template < class data_type>

       ► template < class T >

Here T can be replaced with any name but it is preferable.

       ► class class-name()

class template<class_name>

    

Question No: 21    ( Marks: 1 )    - Please choose one

 Which of the following is incorrect line regarding function template?

       ► template<class T>

       ► template <typename U>

       ► Class<template T>

       ► template  < class T, class U>

   

Question No: 22    ( Marks: 1 )    - Please choose one

 An STL container can not be used to,

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       ► hold objects of class employee.

       ► store elements in a way that makes them quickly accessible.

       ► compile c++ programs.

       ► organize the way objects are stored in memory

   

Question No: 23    ( Marks: 1 )    - Please choose one

 Algorithms can only be implemented using STL containers.

       ► True

       ► False

   

Question No: 24    ( Marks: 1 )    - Please choose one

 Consider a class named Vehicle, which of the following can be the instance of class Vehicle?

1.      Car

2.      Computer

3.      Desk

4.      Ahmed

5.      Bicycle

6.      Truck

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       ► 1, 4, 5

       ► 2, 5, 6

       ► 1, 2, 3, 6

       ► 1, 5, 6

   

Question No: 25    ( Marks: 1 )    - Please choose one

 Consider the code below,

class Fred {

public:

Fred();

...

};

int main()

{

Fred a[10];

Fred* p = new Fred[10];

...

}

Select the best option,

       ► Fred a[10]; calls the default constructor 09 times

Fred* p = new Fred[10];  calls the default constructor 10 times

       ► Produce an error

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       ► Fred a[10]; calls the default constructor 11 times

Fred* p = new Fred[10];  calls the default constructor 11 times

       ► Fred a[10]; calls the default constructor 10 times

Fred* p = new Fred[10];  calls the default constructor 10 times

   

Question No: 26    ( Marks: 1 )    - Please choose one

 When a variable is define as static in a class then all object of this class,

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       ► Have different copies of this variable

       ► Have same copy of this variable

       ► Can not access this variable

       ► None of given

   

Question No: 27    ( Marks: 1 )    - Please choose one

 The life of sub object is dependant on the life of master class in _____________.

       ► Separation

       ► Composition

       ► Aggregation

       ► None of the given

   

Question No: 28    ( Marks: 1 )    - Please choose one

 ___________, which means if A declares B as its friend it does NOT mean that A can access private data of B. It only means that B can access all data of A.

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       ► Friendship is one way only

       ► Friendship is two way only

       ► NO Friendship between classes

       ► Any kind of friendship

   

Question No: 29    ( Marks: 1 )    - Please choose one

 Which of the following operators always takes no argument if overloaded?

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       ► /

       ► -

       ► +

       ► ++

    

Question No: 30    ( Marks: 1 )    - Please choose one

 In Private --------------  only member functions and friend classes or functions of a derived class can convert pointer or reference of derived object to that of parent object

       ► specialization

       ► inheritance

       ► abstraction

       ► composition

   

Question No: 31    ( Marks: 1 )

 Write the syntax of declaring a pure virtual function in a class?

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Ans:

Pure Virtual Function is a Virtual function with no body.

Declaration of Pure Virtual Function:

Since pure virtual function has no body, the programmer must add the notation =0 for declaration of the pure virtual function in the base class.

General Syntax of Pure Virtual Function takes the form:

class classname //This denotes the base class of C++ virtual function
{
public:
virtual void virtualfunctioname() = 0 //This denotes the pure virtual function in C++
};

   

Question No: 32    ( Marks: 1 )

 What is meant by direct base class ?

Ans

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When a class-type is included in the class-base, it specifies the direct base class of the class being declared. If a class declaration has no class-base, or if the class-base lists only interface types, the direct base class is assumed to be object. A class inherits members from its direct base class,

Deriving a class from more than one direct base class is called multiple inheritance.

   

Question No: 33    ( Marks: 2 )

 Describe the way to declare a template class as a friend class of any other class.

Ans

The following example is use of a class template:

template<class L> class Key

{

    L k;

    L* kptr;

    int length;

public:

    Key(L);

    // ...

};

Suppose the following declarations appear later:

Key<int> i;

  Key<char*> c;

  Key<mytype> m;

The compiler would create three objects.

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Question No: 34    ( Marks: 2 )

 What is the purpose of template parameter?

Ans:

There are three kinds of template parameters:

• type
• non-type
• template

You can interchange the keywords class and typename in a template parameter declaration. You cannot use storage class specifiers (static and auto) in a template parameter declaration.

   

Question No: 35    ( Marks: 3 )

 Describe in simple words how we can use template specialization to enforce case sensitive specialization in String class.

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Ans”

The act of creating a new definition of a function, class, or member of a class from a template declaration and one or more template arguments is called template instantiation. The definition created from a template instantiation is called a specialization. A primary template is the template that is being specialized.

create function objects to do the case-insensitive compares, and
then reuse them when also wanting to do case-insensitive sorting
or searching.

   

Question No: 36    ( Marks: 3 )

 Can we use compiler generated default assignment operator in case our class is using dynamic memory? Justify your answer.

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Ans:

the compiler does not make a separate copy of the object. Even if the types are not the same, the compiler is usually able to do a better job with initialization lists than with assignments.

Consider the following constructor that initializes member object x_ using an initialization list: square::square() : x_(whatever) { }. The most common benefit of doing this is improved performance. For example, if the expression whatever is the same type as member variable x_, the result of the whatever expression is constructed directly inside x_ — the compiler does not make a separate copy of the object. Even if the types are not the same, the compiler is usually able to do a better job with initialization lists than with assignments.

As if that wasn't bad enough, there's another source of inefficiency when using assignment in a constructor: the member object will get fully constructed by its default constructor, and this might, for example, allocate some default amount of memory or open some default file. All this work could be for naught if the whatever expression and/or assignment operator causes the object to close that file and/or release that memory (e.g., if the default constructor didn't allocate a large enough pool of memory or if it opened the wrong file).

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Question No: 37    ( Marks: 3 )

 Give the names of three ways to handle errors in a program.

Ans:

The function will throw DivideByZero as an exception that can then be caught by an exception-handling catch statement that catches exceptions of type int. The necessary construction for catching exceptions is a try catch system. If you wish to have your program check for exceptions, you must enclose the code that may have exceptions thrown in a try block.

The catch statement catches exceptions that are of the proper type. You can, for example, throw objects of a class to differentiate between several different exceptions. As well, once a catch statement is executed, the program continues to run from the end of the catch.

the errors can be handled outside of the regular code. This means that it is easier to structure the program code, and it makes dealing with errors more centralized. Finally, because the exception is passed back up the stack of calling functions, you can handle errors at any place you choose.

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Question No: 38    ( Marks: 5 )

 Consider the following code,

class Base{

private:

void base1();

protected:

void base2();

public:

void base3();

};

class Derived: public Base{

private:

void derived1();

protected:

void derived2();

public:

void derived3();

};

int main(){

Derived * derived = new Derived();

return 0;

}

Fill the table below to tell which member functions of Base and Derived classes we can access using the Derived pointer in the code indicated in www.allvupastpapers.blogspot.com      

bold.

Ans:

Function Name	Availability (Yes / No)?
base2()	no
base3()	yes
derived1()	No
derived2()	No
derived3()	Yes

   

Question No: 39    ( Marks: 5 )

 What is the output produced by the following program?

#include<iostream.h>

void sample_function(double test) throw (int);

int main()

{

            try

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            {

                        cout <<”Trying.\n”;

                        sample_function(98.6);

                        cout << “Trying after call.\n”;

            }

            catch(int)

            {

                        cout << “Catching.\n”;

            }

           

            cout << “End program.\n”;

            return 0;

}

void sample_function(double test) throw (int)

{

            cout << “Starting sample_function.\n”;

            if(test < 100)

               throw 42;

}

Ans:

Starting sample_function

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Trying

Trying after call

Catching

End program

   

Question No: 40    ( Marks: 10 )

 Write a publicly derived class “Employee” that is derived from base class named “Company”. Both classes will have function “create()”. Make virtual function of base class and override same function in derived class. Function create will have an output statement of your own choice.

In “main” Create an object of base class and call both functions with same object type.

   

Question No: 41    ( Marks: 10 )

 Write a program in C++ which creates three classes named as

1.      Equation

2.      Linear

3.      Quadratic

Where Linear and Quadratic are inherited from Equation

Each class has the method Graph. Graph method should be pure virtual in Equation class.

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This method should be overridden in both the inherited classes. It is meant to display the Graph shape of its respective class. Graph method of Linear will display the message;

Straight line

Similarly, the Graph method of Quadratic will display the message;

Parabola

In main, call the Graph method of both the Linear and Quadratic equations polymorphically through the parent class (Equation).

Ans:

#include "fraction.h"

#include <iostream>

#include <string>

#include <string.h>

#include <stdlib.h>

class equation;

class equation {

    int a, b;

  public:

    int c ()

      {return (c);}

    void convert (Cequation);

};

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class linear {

  private:

    int side;

  public:

    void set_side (int a)

      {side=a;}

    friend class equation;

};

void equation::convert (Cequation) {

  a = 23;

  b = 45;

}

int main () {

  cequation sqr;

  CRectangle rect;

  sqr.set_side(4);

  rect.convert(sqr);

  cout << rect.area();

  return 0;

}

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