1. Recap
In this session, we will recap:
Concepts of object-oriented methodology
Polymorphism
Inheritance
File Input and Output
Data Structures
Sorting
©NIIT Recap /Slide 1 of 12

2. Recap
Concepts of Object-oriented Methodology
1. Given below is the code snippet for the main()
function and the sample output. Write the code of the
file class to accomplish the same.
#include fstream
void main()
{
file objFile1(“str.tst”);
file objFile2(“int.tst”);
}
Output:
File Opened: str.tst (Is #1 file)
File Opened: int.tst (Is #2 file)
©NIIT Recap /Slide 2 of 12

3. Recap
Concepts of Object-oriented Methodology
(Contd.)
2. Identify the statement that does not hold true for
Destructors.
A It is invoked when an object of the class goes out
of scope, or when the memory occupied by it is
deallocated using the delete operator.
B It is a function that has the same name as that of
the class but is prefixed with a ~(tilde).
C They are always declared as public.
D They do not get inherited by the derived class but
can be explicitly invoked by the base class.
©NIIT Recap /Slide 3 of 12

4. Recap
Concepts of Object-oriented Methodology
(Contd.)
3. Suppose A, B, C are arrays of integers of size M, N
and M+N respectively. The members in array A
appear in ascending order while the members in array
B appear in descending order. Write a user defined
function in C++ to produce third array C by merging
arrays A and B in ascending order. Use A, B and C as
arguments in the function.
©NIIT Recap /Slide 4 of 12

5. Recap
Polymorphism
4. Parameters can be passed to function by two
methods. Discuss.
5. List the operators that cannot be overloaded.
6. Given the class Point with member data x and y.
Overload the operator +=.
©NIIT Recap /Slide 5 of 12

6. Recap
Inheritance
7. Given the class definition, answer the following
questions:
(i) Name the base class and derived class of the class
heavy_vehicle.
(ii) Name the data member(s) that can be accessed
from function displaydata.
(iii) Name the data member(s) that can be accessed by
an object of bus class.
(iv) Is the member function outputdata accessible to
the objects of heavy_vehicle class?
class vehicle
{
int wheels;
protected:
©NIIT Recap /Slide 6 of 12

7. Recap
Inheritance (Contd.)
int passanger;
public:
void inputdata(int,int);
void outputdata();
};
class heavy_vehicle:protected vehicle
{
int diesel_petrol;
protected:
int load;
public:
void readdata(int,int);
void writedata();
};
©NIIT Recap /Slide 7 of 12

8. Recap
Inheritance (Contd.)
class bus:private heavy_vehicle
{
char make[20];
public:
void fetchdata(char);
void displaydata();
};
©NIIT Recap /Slide 8 of 12

9. Recap
File Input and Output
8. Define a class worker with the following specifications:
Private members of class worker
Wno Integer
Wname 25 characters
hrwrk,wgrate Integer
Totwage Integer
calcwg()
Public members of the class worker
in_data() A function to accept values for
wno, wname,hrwrk,wgrate and
©NIIT Recap /Slide 9 of 12

10. Recap
File Input and Output (Contd.)
to calculate totpay.
out_data() A function to display all the data
members on the screen.You
should give definitions of functions.
Write the main() that will read and write the data in
the file worker.dat.
©NIIT Recap /Slide 10 of 12

11. Recap
Data Structures
9. Write a code snippet to add the node to the beginning
of the list.
10. Evaluate the following postfix expression using a
stack. Show the contents of stack after execution of
each operation: 20, 8, 4, /, 2, 3, +, *, -.
11. Convert the following inifx expressions to postfix
expressions:
1. (((8*7)+4)/6)
2. (((5*6)/2)-5)
3. ((3+2)*(7+6))
12. List and briefly explain the different type of queue
with example.
©NIIT Recap /Slide 11 of 12

12. Recap
Sorting
13. List the steps that you will follow to apply the
following sorting methods:
a. Selection sort
b. Merge sort
©NIIT Recap /Slide 12 of 12