C-and-C++/C4/File-Handling-In-C/Gujarati

Time	Narration
00.01	Welcome to the spoken-tutorial on files in C.
00.05	In this tutorial we will learn how,
00.08	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.
00.51	Note that our filename 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	filename is the name of the file that we want to open or create.
01.49	We can give the path along with the filename
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 an 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
03.00	gcc space file dot c space hyphen o space file
03.06	Press Enter
03.07	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 an 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 equals 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
05.38	gcc space readfile dot c space hyphen o space read
05.45	Now press Enter
05.47	To execute, type ./read
05.52	The output is displayed as:
05.54	Welcome to the Spoken-Tutorial.
05.56	This is an 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.
06.04	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.
06.18	eg. fp = fopen(“Sample.txt”, “r”);
06.25	As an assignment,
06.26	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

Jyotisolanki, PoojaMoolya, Pratik kamble