Difference between revisions of "Advanced-C++/C2/Exception-Handling/English-timed"
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| − | |''' | + | |'''throw:''' |
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| − | |We can have more than one '''try, catch | + | |We can have more than one '''try, catch''' blocks. |
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| − | |Let us go through the code. | + | |Let us go through the '''code'''. |
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| − | |If '''True''', we '''throw''' an '''exception''' | + | |If '''True''', we '''throw''' an '''exception''' "Division by zero condition!". |
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| − | | Open the '''terminal''' by pressing '''Ctrl, Alt''' and '''T '''keys simultaneously on your keyboard. | + | | Open the '''terminal''' window by pressing '''Ctrl, Alt''' and '''T '''keys simultaneously on your keyboard. |
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| − | |'''Enter the value of x and y | + | |'''Enter the value of x and y''' |
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| − | |The '''output''' is displayed as: '''Division by zero condition''' | + | |The '''output''' is displayed as: '''Division by zero condition!''' |
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| − | | This is how the '''try catch''' and '''throw block''' work. | + | | This is how the '''try, catch''' and '''throw block''' work. |
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| − | |In this tutorial, we have seen- '''Exception Handling''', ''' | + | |In this tutorial, we have seen- '''Exception Handling''', '''try''', '''catch''' and '''throw blocks'''. |
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| − | | Watch the video available at the link shown. | + | | Watch the video available at the link shown below. |
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Revision as of 13:01, 29 June 2015
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Exception Handling in C++. |
| 00:07 | In this tutorial, we will learn |
| 00:09 | Exception Handling. |
| 00:11 | We will do this with the help of an example. |
| 00:14 | To record this tutorial, I am using: |
| 00:16 | * Ubuntu OS version 11.10 |
| 00:20 | * g++ compiler version 4.6.1 |
| 00:25 | Let us start with an introduction to Exception. |
| 00:29 | An exception is a problem that arises during the execution of a program. |
| 00:34 | It is a run-time error that a program may detect. |
| 00:39 | Let us move on to exception handling. |
| 00:42 | The response given to the problems occurred during the execution of the program is known as exception handling. |
| 00:50 | Exception handling allows a program to continue execution. |
| 00:55 | It helps identifying the problem. |
| 00:57 | And terminates the program in a controlled manner. |
| 01:02 | Let us see the types of Exceptions- |
| 01:05 | * Try |
| 01:06 | * Catch and |
| 01:07 | * Throw. |
| 01:09 | We place the error prone code inside a try block. |
| 01:13 | Then it is handled using throw. |
| 01:16 | After this, the exception is caught using the catch statement. |
| 01:21 | And then it is processed. |
| 01:23 | The syntax for try, catch and throw is: |
| 01:27 | throw: |
| 01:28 | The try block and the catch block. |
| 01:32 | Here, we pass argument. |
| 01:35 | The throw statement can be written inside the try block as well. |
| 01:40 | We can have more than one try, catch blocks. |
| 01:44 | Now, let us see an example on exception handling. |
| 01:48 | I have the code, I will open it. |
| 01:51 | Note that our file name is exception.cpp. |
| 01:55 | In this program, we will solve the 'divide by zero' error using exception handling. |
| 02:02 | Let us go through the code. |
| 02:04 | This is our header file as iostream. |
| 02:07 | Here we are using the std namespace. |
| 02:11 | Here we have function division() with argument as int a and int b. |
| 02:18 | Then we check whether b ==0. |
| 02:22 | If True, we throw an exception "Division by zero condition!". |
| 02:27 | The function returns division of a and b. |
| 02:32 | This is our main() function. |
| 02:34 | In this, we have declared integer variables as x, y and a double variable as z. |
| 02:42 | Here we accept the value of x and y. |
| 02:46 | This is our try block. |
| 02:48 | Here, we have called the function division() |
| 02:51 | and stored the result in z. |
| 02:54 | Then we print the value of z. |
| 02:57 | This is our catch block. |
| 02:59 | In this, we pass an argument 'msg' as a character constant. |
| 03:06 | Then we print the msg. |
| 03:08 | And this is our return statement. |
| 03:11 | Now, let us execute the program. |
| 03:13 | Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard. |
| 03:21 | To compile, type:
g++ space exception dot cpp space hyphen o space ex. Press Enter. |
| 03:32 | Type: dot slash ex, press Enter. |
| 03:36 | Enter the value of x and y |
| 03:38 | I will give as 3 and 0. |
| 03:42 | The output is displayed as: Division by zero condition! |
| 03:46 | Let us compile again. |
| 03:48 | Press the up-arrow key twice. |
| 03:51 | Press Enter. |
| 03:52 | Again press the up-arrow key twice. |
| 03:55 | Enter value of x and y |
| 03:57 | I will give as 8 and 2. |
| 04:01 | The output is 4. |
| 04:04 | This is how the try, catch and throw block work. |
| 04:08 | This brings us to the end of this tutorial. |
| 04:11 | Let us come back to our slides. |
| 04:14 | Let us summarize. |
| 04:16 | In this tutorial, we have seen- Exception Handling, try, catch and throw blocks. |
| 04:23 | As an assignment- Display the age of employees. |
| 04:26 | Throw an exception to check that the age is not less than 15. |
| 04:31 | Watch the video available at the link shown below. |
| 04:34 | It summarizes the Spoken-Tutorial project. |
| 04:38 | If you do not have good bandwidth, you can download and watch it. |
| 04:42 | The Spoken Tutorial Project team: conducts workshops using spoken tutorials. |
| 04:48 | Gives certificates to those who pass an online test. |
| 04:52 | For more details, please write to: contact@spoken-tutorial.org |
| 04:59 | Spoken Tutorial Project is a part of the "Talk to a Teacher" project. |
| 05:04 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 05:11 | More information on this mission is available at the link shown below: http://spoken-tutorial.org/NMEICT-Intro |
| 05:16 | This is Ashwini Patil from IIT Bombay, signing off.
Thank You for joining. |
