BCA213 - Object Oriented Programming C++

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BACHELOR OF COMPUTER APPLICATIONS (BCA)

SEMESTER - II

SUBJECT CODE & NAME

BCA213 - Object Oriented Programming C++

Q1. Differentiate between an external variable and an automatic variable with the help of an example. 10

Answer. Automatic variables is default variable in C++. All the variables we have created and used in programs are automatic variables. These variables can also be declared by prefixing the keyword auto. One of important characteristics of

Q2. What is “this pointer” in C++? What are the features of “this pointer”? [3+7]

Answer. The pointer is used as a pointer to the class object instance by the member function. The address of the class instance is passed as an implicit parameter to the member functions. The sample below, in this section shows how to use it. It is common knowledge that C++ keeps only one copy of each member function

Q3. Explain destructor in detail. 10

 Answer. Destructors are usually used to deallocate memory and do other cleanup for a class object and its class members when the object is destroyed. A destructor is called for a class object when that object passes out of scope or is

Set - 2

Q1. What is Polymorphism? What are the different types of Polymorphism? 3+7

Answer. Polymorphism means same content but different forms. In C++, polymorphism enables the same program code calling different functions of different classes. Imagine a situation where you would like to create a class shape and derive classes such as rectangle, circle, triangle etc. Let us suppose each of the classes has a member function draw() that causes the object to be drawn on the screen. You would like to write a common code as

Q2. Explain sequence containers. 10

Answer. STL provides a number of container types, representing objects that contain other objects. The STL contains sequence containers and associative containers. The standard sequence containers include vector, deque and list

Q3. Discuss the following functions of file operations

a) tellg ()

b) seekp ()

c) ignore ()

d) getline () 2.5x4

Answer. a) tellg()

tellg() – Returns an int type, that shows the current position of the inside-pointer. This one works only when you read a file. Example:

#include <

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