C-and-C++/C4/File-Handling-In-C/English-timed

Time	Narration
00:01	Welcome to the spoken-tutorial on files in C .
00:05	In this tutorial we will learn:
00:08	How to open a file.
00:10	How to read data from a file.
00:12	How to write data into a file.
00:15	Few examples.
00:17	To record this tutorial, I am using
00:20	Ubuntu Operating System version 11.10,
00:24	gcc Compiler version 4.6.1.
00:28	Let us start with the introduction to files.
00:31	File is a collection of data.
00:34	It can be a database, a program, a letter or anything.
00:39	We can create a file and access it using C.
00:44	Now let us see an example on file handling in C.
00:48	I have a written program.
00:50	Let's take a look Note that our file name is file.c
00:55	In this program we will create a file and write data into it.
01:01	Let me explain the code now.
01:03	This is our header file.
01:05	This is our main() function.
01:07	To define a file variable we use the type FILE.
01:12	The FILE variable is defined under the header stdio.h.
01:19	*fp is a pointer to the FILE variable.
01:22	It will store all the information about the file ,
01:26	like its name, status and current information.
01:31	Let us go back to our slides.
01:33	Now we will see the syntax to open a file.
01:37	Here, the fopen() function opens a stream.
01:42	Then it links the file with the stream.
01:44	file name is the name of the file that we want to open or create.
01:49	We can give the path along with the file name.
01:53	And We can also give the extension.
01:56	Here we can give the mode of the file.
01:59	Let us see the types of modes :
02:02	"w" - creates file for read and write.
02:06	"r" – opens file for reading.
02:09	"a" – writing at the end of the file.
02:12	Now come back to our program.
02:15	Here, we create a Sample.txt file in write mode.
02:20	We can see that the path is given.
02:23	Our file will be created on the desktop.
02:27	Then we will write the statements into the file.
02:30	"Welcome to the spoken-tutorial" and
02:32	"This is a test example".
02:34	fprintf() writes output to the given output stream.
02:39	fclose() closes the file associated with the stream.
02:43	And this is our return statement.
02:46	Now click on Save.
02:48	Let us execute the program.
02:50	Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
02:59	To compile, type gcc space file dot c space hyphen o space file
03:06	Press Enter To execute, type dot slash file (./file).
03:11	Press Enter.
03:13	We see the file is executed.
03:15	Now we will check it out.
03:17	Let us open the Home folder.
03:20	Click on the Home folder option.
03:22	Now click on the Desktop option.
03:25	Here is our sample.txt file.
03:29	This shows that our file is successfully created.
03:32	Now let us open.
03:34	Double click on the file.
03:36	We can see the messages here.
03:39	Welcome to the Spoken Tutorial.
03:41	This is a test example.
03:44	This is how we create a file and write data into it.
03:48	Now we will see how to read data from a file.
03:52	I have already made the program.
03:54	I will open it.
03:56	In this program, we will read data from our sample.txt file and print the data on the console.
04:03	Let me explain the code now.
04:05	This is our header file.
04:08	This is our main() function.
04:10	Here, a file variable and a pointer to the file variable is defined.
04:15	Then we have declared a character variable c.
04:19	Here, we open the file Sample.txt in read mode.
04:24	The output is stored in fp.
04:27	Then we check the condition-
04:29	"If fp is equal to NULL ".
04:32	If the condition is true then we print the message:
04:36	"File doesn't exist."
04:38	Else, it will check for another condition-
04:41	While c is not equal to EOF.
04:46	Here, EOF is the end of file.
04:49	It denotes the end of input.
04:52	It is a condition where no more data can be read from a data source.
04:57	If the condition is true then it will display the characters from Sample.txt file, on the console.
05:06	Here, getc returns a character from a specified file or stream.
05:12	Now, it will return a character from our Sample.txt file.
05:17	putchar is used to display a character on the console.
05:22	Then it will store the characters in variable c.
05:25	Here we close the file.
05:28	And this is our return statement.
05:30	Now click on Save.
05:32	Let us execute the program.
05:35	Come back to the terminal.
05:37	To compile, type gcc space readfile dot c space hyphen o space read
05:45	Now press Enter .
05:47	To execute, type ./read (dot slash read).
05:52	The output is displayed as:
05:54	Welcome to the Spoken-Tutorial.
05:56	This is a test example.
05:59	This brings us to the end of this tutorial.
06:01	Come back to our slides.
06:03	Let us summarize .In this tutorial we learnt:
06:06	File handling,
06:08	To write data into a file.
06:10	eg. fp = fopen(“Sample.txt”, “w”);
06:17	To read data from a file. eg. fp = fopen(“Sample.txt”, “r”);
06:25	As an assignment- Write a program to create a file TEST.
06:30	Write your name and address in the file TEST.
06:33	Then display it on the console using C Program.
06:37	Watch the video available at the link shown below.
06:40	It summarizes the Spoken Tutorial project.
06:43	If you do not have good bandwidth, you can download and watch it.
06:47	The Spoken Tutorial Project Team:
06:50	Conducts workshops using spoken tutorials.
06:53	Gives certificates to those who pass an online test.
06:57	For more details, please write to, contact@spoken-tutorial.org.
07:03	Spoken Tutorial Project is a part of Talk to a Teacher project.
07:07	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
07:14	More information on this Mission is available at the link shown below.
07:18	This is Ashwini Patil from IIT Bombay, signing off.
07:22	Thank You for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14