Object Oriented programming with C++ - B.C.A 18-21 Sem2


SAINTGITS COLLEGE OF APPLIED SCIENCES
First Internal Assessment Examination, FEB 2019
Department of BCA, Semester II
Object Oriented  programming in C++

Time  : 2 hours                                                                           Total:50 Marks

Section A
Answer any 5 questions. Each question carries 2 marks.

1.    Define class?
A class is a way to bind the data and its associated functions together.A class can have both variables and functions.
2.    Write a program to find the area of a square using class?
#include<iostream.h>
class area
{
int side,A;
public:
 void getdata();
void calculate();
};
void area::getdata()
{
cout<<”enter the side”;
cin>>side;
}
void area::calaculate()
{
a=side*side;
cout<<”area of square is”<<a;
}
void main()
{
area obj;
obj.getdata();
obj.calaculate();
getch();
}

3.    Define friend functions?
A function declared as friend is known as friend function. It is not in the scope of the class to which it has been declared as friend. It has full access to the private members of the class.
Declaration and definition syntax.
4.    Explain inline function?
When a function is declared inline the compiler replaces the function call with the respective function code. Normally a small size function is made as inline.
5.    Explain for loop?
Entry controlled loop.
Syntax and example.

6.Explain memory allocation for objects?
The member functions are created and placed in the memory space only once when they are defined. Space for member variables is allocated separately for each object.
                                                                                                                       (5 X 2 = 10 marks)

                                                                       Section B
Short essay questions
Answer any 5 questions. Each question carries 5 marks.

7. Explain static variables and functions?
     A data member of a class can be declared as a static and is normally used to maintain values common to the entire class.
The static member variables must be defined outside the class.
Example programs and figure.
Characteristics of static data and functions.
8. Write an example program using classes and objects?
 Any program using class and object.
#include<iostream.h>
class area
{
int side,A;
public:
 void getdata();
void calculate();
};
void area::getdata()
{
cout<<”enter the side”;
cin>>side;
}
void area::calaculate()
{
a=side*side;
cout<<”area of square is”<<a;
}
void main()
{
area obj;
obj.getdata();
obj.calaculate();
getch();
}
9. Explain Arrays of objects with example?
The array of type class contains the objects of the class as its individual elements. Thus, an array of a class type is also known as an array of objects. An array of objects is declared in the same way as an array of any built-in data type.
class books
{
char tit1e [30];
float price ;
public:
void getdata ();
void putdata ();
} ;

void books :: getdata ()
{
cout<<"Title:”;
Cin>>title;
cout<<"Price:”;
cin>>price;
}

void books :: putdata ()
{
cout<<"Title:"<<title<< "\n";
cout<<"Price:"<<price<< "\n”;
const int size=3 ;
int main ()
{
books book[size] ;
for(int i=0;i<size;i++)
{
cout<<"Enter details o£ book "<<(i+1)<<"\n";
book[i].getdata();
}
for(int i=0;i<size;i++)

{
cout<<"\nBook "<<(i+l)<<"\n";
book[i].putdata() ;
}
return 0;
}


10. Explain function overloading?
Function overloading is a feature in C++ where two or more functions can have the same name but different parameters.
Function overloading can be considered as an example of polymorphism feature in C++.
Any example program.
#include <iostream>
using namespace std;
 void print(int i)
{
  cout << " Here is int " << i << endl;
}
void print(double  f)
 {
  cout << " Here is float " << f << endl;
}
void print(char const *c)
 {
  cout << " Here is char* " << c << endl;
}
 
int main() {
  print(10);
  print(10.10);
  print("ten");
  return 0;
}
11. Explain program structure of C++?

Include Files
Class Declaration
Member Function definitions
Main Function Program

Explain each one with Example statements.
12.  Differentiate POP and OOP?
Divided Into
In POP, program is divided into small parts called functions.     
In OOP, program is divided into parts called objects.
Importance
In POP,Importance is not given to data but to functions as well as sequence of actions to be done.
In OOP, Importance is given to the data rather than procedures or functions because it works as a real world.
Approach
POP follows Top Down approach.      
OOP follows Bottom Up approach.
Access Specifiers
POP does not have any access specifier.          
OOP has access specifiers named Public, Private, Protected, etc.
Data Moving
           In POP, Data can move freely from function to function in the system.  
In OOP, objects can move and communicate with each other through member functions.
Expansion    
To add new data and function in POP is not so easy.    
OOP provides an easy way to add new data and function.
Data Access
In POP, Most function uses Global data for sharing that can be accessed freely from function to function in the system.
In OOP, data can not move easily from function to function,it can be kept public or private so we can control the access of data.
Data Hiding
           POP does not have any proper way for hiding data so it is less secure.
           OOP provides Data Hiding so provides more security
Overloading
In POP, Overloading is not possible.    
In OOP, overloading is possible in the form of Function Overloading and Operator Overloading.
Examples     
Example of POP are : C, VB, FORTRAN, Pascal.           Example of OOP are : C++, JAVA, VB.NET, C#.NET.
.
(5 X 5 = 25 marks)

Section C
Long essay questions
Answer any 1question. It carries 15marks.

13. Explain OOPs Concepts?
 Explain class and objects, abstraction, encapsulation, polymorphism, inheritance etc. with figure and examples.
14. Explain constructors in C++?
Explain constructors and characteristics.
Explain default, parameterized and copy constructors with example.

(1 X 15 = 15 marks)
_____________________

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