Difference between revisions of "Advanced-C++/C2/Abstract-Class/English"

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(Created page with ''''Title of script''': Abstract class and pure virtual function in C++ '''Author: '''Ashwini Patil '''Keywords: abstract class, pure virtual function, Video tutorial.''' {| …')
 
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Pure virtual function
 
Pure virtual function
  
We will do this with the help of an example.
+
We will do this through an example.
  
 
|-
 
|-
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| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| To record this tutorial, I am using
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| To record this tutorial, I am using
  
'''Ubuntu OS '''version 11.04
+
'''Ubuntu OS '''version 11.10
  
 
'''g++ compiler '''v. 4.6.1
 
'''g++ compiler '''v. 4.6.1
Line 41: Line 41:
 
|-
 
|-
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Slide 4
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Slide 4
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| '''Abstract class '''is used as a base class.
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us start with an introduction to an abstract class.
  
It contains one '''pure virtual function.'''
+
'''Abstract class '''is used as a base class.
 +
 
 +
It contains atleast one '''pure virtual function.'''
  
 
We cannot create an instance of '''abstract class.'''
 
We cannot create an instance of '''abstract class.'''
Line 49: Line 51:
 
|-
 
|-
 
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Slide 5
 
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Slide 5
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| A '''pure virtual function''' is a function with no body.
+
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us see pure virtual function.
 +
 
 +
A '''pure virtual function''' is a function with no body.
  
 
It is not defined in the base class.
 
It is not defined in the base class.
Line 69: Line 73:
  
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us look at an example
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us look at an example
 +
 +
I have already typed the code on the editor.
 +
 +
Note that our filename is '''abstract.cpp'''
  
 
This example involves addition and subtraction of two numbers.
 
This example involves addition and subtraction of two numbers.
  
I have already typed the code on the editor.
+
 
 +
 
  
 
|-
 
|-
Line 78: Line 87:
  
 
'''abstract.cpp'''
 
'''abstract.cpp'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| I have saved the file with the name '''abstract.cpp'''
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us go through the code.
 
+
Let me explain the code now.
+
  
 
|-
 
|-
Line 92: Line 99:
  
 
'''using namespace std;'''
 
'''using namespace std;'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| This is the using statement.
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here are using '''std namespace.'''
  
 
|-
 
|-
Line 113: Line 120:
  
 
'''virtual void numbers()=0;'''
 
'''virtual void numbers()=0;'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| In this we have '''pure virtual function''' as '''numbers '''initialized to '''0.'''
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| In this we have declared a''' virtual function named numbers.'''
  
This is the declaration for virtual function.
+
'''It i'''s initialized to '''0.'''
 
+
It is defined when it is used.
+
  
 
|-
 
|-
Line 128: Line 133:
  
  
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Then a non-virtual function '''input''' is declared.
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Then we have a non-virtual function.
  
And we have '''a''' and '''b''' as integer variables.
+
And two integer variables as '''a''' and '''b'''.
  
 
|-
 
|-
Line 144: Line 149:
  
 
'''}'''
 
'''}'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| In function '''input''' we take the value of '''a''' and '''b''' as user input.
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here we access the input function.
 +
 
 +
In this we accept the numbers a and b.
 +
 
 +
 
 +
 
  
 
|-
 
|-
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| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Now we create a''' derived class '''as''' add.'''
+
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| This is a''' derived class''' named''' add.'''
  
It inherits the''' base class abstractinterface.'''
+
It inherits the properties of the '''base class abstractinterface.'''
  
 
|-
 
|-
Line 173: Line 183:
  
 
'''}'''
 
'''}'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Now we have '''function numbers'''
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here we override the function numbers.
  
In this we add the values''' of a '''and''' b.'''
+
In this we perform addition of two numbers '''a '''and''' b.'''
  
And print the sum.
+
And store the result in integer variable''' sum.'''
 +
 
 +
Then we print the result.
  
 
|-
 
|-
Line 187: Line 199:
  
 
'''public: '''
 
'''public: '''
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here we create another '''derived class''' '''sub.'''
+
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here we have another '''derived class '''as '''sub.'''
  
 
This also inherits the''' base class abstractinterface.'''
 
This also inherits the''' base class abstractinterface.'''
Line 205: Line 217:
  
 
'''}'''
 
'''}'''
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Then we have '''numbers''' function.
+
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| In this again we override the function numbers.
  
This calculates the difference of two numbers.
+
And here we calculate the difference of two numbers a and b.
  
And prints the result.
+
Then we print the difference.
  
 
|-
 
|-
Line 225: Line 237:
  
 
'''obj1.numbers();'''
 
'''obj1.numbers();'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here, '''obj1''' is the object of '''class add.'''
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Here we create an object of class '''add as''' '''obj1.'''
  
Then we call function''' input '''and''' numbers '''using object''' obj1.'''
+
Then we call both the functions''' input '''and''' numbers '''using the object''' obj1.'''
  
 
|-
 
|-
Line 237: Line 249:
  
 
'''obj2.numbers();'''
 
'''obj2.numbers();'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Now we create an object '''obj2''' of '''class sub.'''
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Then we create another object of '''class sub as obj2.'''
  
And we call the''' input '''and''' numbers function '''using object''' obj2.'''
+
Again we call the two functions''' '''using the object''' obj2.'''
  
 
|-
 
|-
Line 245: Line 257:
  
 
'''return 0;'''
 
'''return 0;'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| This is the '''return''' statement.
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| And this is our '''return''' statement.
 
+
|-
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Click on '''Save'''
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Now Click on '''Save'''
+
  
 
|-
 
|-
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"|  
 
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"|  
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us execute
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Now let us execute the program.
  
 
|-
 
|-
Line 259: Line 267:
  
 
'''Ctrl, Alt and T'''keys simultaneously
 
'''Ctrl, Alt and T'''keys simultaneously
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Open the terminal by pressing '''Ctrl, Alt and T '''keys simultaneously
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Open the terminal by pressing '''Ctrl, Alt and T '''keys  
 +
 
 +
Simultaneously on your keyboard.
  
 
|-
 
|-
Line 271: Line 281:
  
 
'''./abs'''
 
'''./abs'''
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| To compile the program type  
+
| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| To compile the program type:
  
 
'''g++ abstract.cpp -o abs'''
 
'''g++ abstract.cpp -o abs'''
  
To execute type
+
'''Press Enter'''
 +
 
 +
Type:
  
 
'''./abs'''
 
'''./abs'''
 +
 +
'''Press Enter'''
  
 
|-
 
|-
Line 287: Line 301:
 
Enter the numbers  
 
Enter the numbers  
  
I will enter as 12
+
I will enter as:
 +
 
 +
9 and
  
 
4
 
4
  
The output is displayed as '''16'''
+
The output is displayed as  
 +
 
 +
'''Sum is 13'''
 +
 
 +
Again we see
  
 
Enter the numbers
 
Enter the numbers
Line 297: Line 317:
 
I will enter as
 
I will enter as
  
9
+
'''8''' and
  
3
+
'''3'''
  
The output is displayed as '''6'''
+
The output is displayed as  
 +
 
 +
'''Diff is 5'''
  
 
|-
 
|-
Line 307: Line 329:
 
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| This brings us to the end of this tutorial.
 
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| This brings us to the end of this tutorial.
  
Let us move back to slides.
+
Come back to our slides.
  
 
|-
 
|-
Line 313: Line 335:
  
 
Summary
 
Summary
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| In this tutorial we have seen
+
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Let us summarize.
 +
 
 +
In this tutorial we learnt,
  
 
'''Abstract class'''
 
'''Abstract class'''

Revision as of 10:12, 10 May 2013

Title of script: Abstract class and pure virtual function in C++

Author: Ashwini Patil

Keywords: abstract class, pure virtual function, Video tutorial.


Visual Cue
Narration
Slide 1 Welcome to the spoken tutorial on abstract class and pure virtual function in C++.
Slide 2


In this tutorial we will learn,

Abstract Classes

Pure virtual function

We will do this through an example.

Slide 3


To record this tutorial, I am using

Ubuntu OS version 11.10

g++ compiler v. 4.6.1

Slide 4 Let us start with an introduction to an abstract class.

Abstract class is used as a base class.

It contains atleast one pure virtual function.

We cannot create an instance of abstract class.

Slide 5 Let us see pure virtual function.

A pure virtual function is a function with no body.

It is not defined in the base class.

It is declared as follows:

virtual void virtualfunname()=0;

A derived class must override the function.

Otherwise will give an error.

It is upto a derived class to implement the function.

Open abstract.cpp


Let us look at an example

I have already typed the code on the editor.

Note that our filename is abstract.cpp

This example involves addition and subtraction of two numbers.



Point the cursor

abstract.cpp

Let us go through the code.
Highlight

#include<iostream>

This is our header file iostream.
Highlight

using namespace std;

Here are using std namespace.
Highlight

class abstractinterface


This is declaration for a class named abstractinterface.
Highlight

public:

Then we have public specifier.
Highlight

virtual void numbers()=0;

In this we have declared a virtual function named numbers.

It is initialized to 0.

Highlight

void input();

int a, b;


Then we have a non-virtual function.

And two integer variables as a and b.

Highlight

void abstractinterface::input()

{

cout<< "Enter the numbers\n";

cin>>a>>b;

}

Here we access the input function.

In this we accept the numbers a and b.



Highlight

class add : public abstractinterface


This is a derived class named add.

It inherits the properties of the base class abstractinterface.

Highlight

public:

void numbers()

{

int sum;

sum=a+b;

cout<<"sum is "<<sum<<"\n";

}

Here we override the function numbers.

In this we perform addition of two numbers a and b.

And store the result in integer variable sum.

Then we print the result.

Highlight

class sub : public abstractinterface

{

public:

Here we have another derived class as sub.

This also inherits the base class abstractinterface.

Highlight

void numbers()

{

int diff;

diff=a-b;

cout<<"diff is "<<diff<<"\n";

}

In this again we override the function numbers.

And here we calculate the difference of two numbers a and b.

Then we print the difference.

Highlight

int main()

This is our main function.
Highlight

add obj1;

obj1.input();

obj1.numbers();

Here we create an object of class add as obj1.

Then we call both the functions input and numbers using the object obj1.

Highlight

sub obj2;

obj2.input();

obj2.numbers();

Then we create another object of class sub as obj2.

Again we call the two functions using the object obj2.

Highlight

return 0;

And this is our return statement.
Now let us execute the program.
Open the terminal

Ctrl, Alt and Tkeys simultaneously

Open the terminal by pressing Ctrl, Alt and T keys

Simultaneously on your keyboard.

Type

g++ abstract.cpp -o abs

To execute

Type

./abs

To compile the program type:

g++ abstract.cpp -o abs

Press Enter

Type:

./abs

Press Enter

Highlight

Output

It is displayed as

Enter the numbers

I will enter as:

9 and

4

The output is displayed as

Sum is 13

Again we see

Enter the numbers

I will enter as

8 and

3

The output is displayed as

Diff is 5

This brings us to the end of this tutorial.

Come back to our slides.

Slide 6

Summary

Let us summarize.

In this tutorial we learnt,

Abstract class

eg. class abstractinterface

Pure virtual function

eg. virtual void numbers()=0;

Slide 7

Assignment

As an assignment

Create an abstract class student.

Create a pure virtual function as Info

Accept the name and roll no of the student in the function.

Create two derived class marks and sports.

In marks accept marks of three subjects.

In sports enter marks scored in sports.

Calculate the total marks.

Then create another derived class result.

In this display the name, roll-no, total marks of the student.

Slide 8

About the Spoken Tutorial Project

Watch the video available at the link shown

It summarizes the Spoken Tutorial project

If you do not have good bandwidth, you can download and watch it

Slide 9

Spoken Tutorial Workshops

The Spoken Tutorial Project Team

Conducts workshops using spoken tutorials

Gives certificates to those who pass an online test

For more details, please write to,

contact@spoken-tutorial.org

Slide Number 10


Acknowledgement

Spoken Tutorial Project is a part of the Talk to a Teacher project

It is supported by the National Mission on Education through ICT, MHRD, Government of India

More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro

This is Ashwini Patil from IIT Bombay signing off

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Contributors and Content Editors

Ashwini, Nancyvarkey