Ashwini at 07:18, 17 July 2013

2013-07-17T07:18:22Z

Ashwini: Created page with ''''Title of script''': Objects and Classes in C++ '''Author: '''Ashwini Patil '''Keywords: Exception handling, try, catch, throw Video tutorial.''' {| style="border-spacing:…'

2013-05-06T07:55:19Z

Created page with ''''Title of script''': Objects and Classes in C++ '''Author: '''Ashwini Patil '''Keywords: Exception handling, try, catch, throw Video tutorial.''' {| style="border-spacing:…'

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'''Title of script''': Objects and Classes in C++

'''Author: '''Ashwini Patil

'''Keywords: Exception handling, try, catch, throw Video tutorial.'''

{| style="border-spacing:0;"
| style="background-color:#ffffff;border-top:1pt solid #000000;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;"| <center>'''Visual Cue'''</center>
| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| <center>'''Narration'''</center>

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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;"| Welcome to the spoken tutorial on Exception Handling in C++.

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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;"| In this tutorial we will learn,

Exception Handling.

We will do this with the help of an example.

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'''Ubuntu OS '''version 11.04

'''gcc '''and '''g++ compiler '''v. 4.6.1

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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;"| Let us start with the introduction to exception handling.

The response given to the problems occured during the execution of the program.

Exception handling allows a program to continue execution.

Helps Identifying the problem.

Terminates the program in a controlled manner.

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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;"| Types of Exception handling

Try

Catch

Throw

We place the error prone code inside a try block

Then it is Handled using throw.

after this the exception is caught, using catch

And it is processed.

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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;"| The syntax for try catch is:

try {

// try block

}

catch (type1 arg) {

// catch block

}

catch (type2 arg) {

// catch block

}

As we discussed earlier,

When an exception is thrown it is cought by the catch statement.

We can have more than one try-catch blocks.

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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 let us see an example on exception handling.

I have the code, i will explain it to you.

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In this program we will solve the divide by zero error using exception handling.

Let me explain the code now.

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'''<nowiki>#include <iostream> </nowiki>'''

'''using namespace std;'''
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We have used '''std namespace.'''

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'''double division(int a, int b) '''

'''{ '''

'''if( b == 0 ) '''

'''{ '''

'''throw "Division by zero condition!"; '''

'''} '''

'''return (a/b); '''

'''}'''
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We check whether''' b ==0.'''

If true, we throw an exception.

The function returns division of''' a '''and''' b'''

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'''int main()'''
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'''int x,y; '''

'''double z; '''

'''<nowiki>cout<<"Enter value of x and y\n"; </nowiki>'''

'''cin>>x>>y;'''
| 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 declared three variables as '''x,''' '''y '''and''' z.'''

Then we accept the values of''' x '''and''' y '''from user.

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'''try '''

'''{ '''

'''z = division(x, y); '''

'''<nowiki>cout << z<<"\n"; </nowiki>'''

'''}'''
| 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 our '''try block'''

Inside it we use call the function''' division.'''

It is stored in''' z.'''

Then we print the value of''' z.'''

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'''catch (const char* msg) '''

'''{ '''

| 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 is our''' catch block.'''

We pass an''' argument msg '''as a''' character constant.'''

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'''<nowiki>cout << msg << endl; </nowiki>'''

'''} '''
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'''return 0;'''
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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;"| Now Click on '''Save'''

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'''Ctrl, Alt and T '''keys simultaneously
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'''g++ exception.cpp -o exp'''

To execute

Type

'''./exp'''
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'''g++ exception.cpp -o exp'''

To execute

Type

'''./exp'''

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'''Output'''
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'''Enter the value of x and y:'''

'''I will first enter as 20 and 2'''

'''The output is displayed as:'''

'''10.'''

'''Now let us execute again'''

'''This time i will enter the values as 30 and 0'''

'''The output is displayed as:'''

'''Divide by zero condition.'''

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Let us come back to the slides

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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,

Exception Handling

Try

Catch

Throw

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Assignment
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Display the age of employess.

Throw an exception to check that the age is not less than 15.

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About the Spoken Tutorial Project
| 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;"| 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

|-
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Spoken Tutorial Workshops
| 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;"| 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

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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:0.25pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.018cm;padding-right:0.018cm;"| Slide Number 10

Acknowledgement
| 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;"| 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 Indiaabout:startpage

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

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| style="background-color:#ffffff;border-top:0.25pt solid #c0c0c0;border-bottom:0.25pt solid #c0c0c0;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 Ashwini Patil from IIT Bombay signing off

Thank You for joining.

|}

Advanced-C++/C2/Exception-Handling/English - Revision history

Ashwini at 07:18, 17 July 2013

Ashwini: Created page with ''''Title of script''': Objects and Classes in C++ '''Author: '''Ashwini Patil '''Keywords: Exception handling, try, catch, throw Video tutorial.''' {| style="border-spacing:…'