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| − | |'''Time'''
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| − | |'''Narration'''
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| − | | 00.01
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| − | |Welcome to the spoken-tutorial on Files in C
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| − | | 00.05
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| − | |In this tutorial we will learn,
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| − | | 00.07
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| − | |How to open a file.
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| − | | 00.09
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| − | |How to read data from file
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| − | | 00.12
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| − | |How to write data into a file
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| − | | 00.14
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| − | | Few examples
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| − | | 00.17
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| − | |To record this tutorial i am using, Ubuntu Operating System version 11.10,
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| − | | 00.23
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| − | | gcc Compiler version 4.6.1
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| − | | 00.28
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| − | |Let us start with an introduction to Files
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| − | |File is a collection of data
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| − | |00.34
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| − | |It can be a database, a program, a letter or anything
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| − | |00.39
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| − | |We can create a file and access it using C.
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| − | | 00.43
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| − | |Now, let us see an example on File handling in C.
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| − | | 00.48
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| − | | I have a written progam, lets take a look
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| − | | 00.51
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| − | |Note that our file name is file.c
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| − | | 00.55
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| − | |In this program we will create a file and write data into it.
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| − | | 01.00
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| − | |Let me explain the code now
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| − | | 01.03
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| − | |This is our header file
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| − | | 01.05
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| − | |This is our main function
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| − | |01.07
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| − | |To define a file variable we use the type File.
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| − | | 01.12
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| − | |The File variable is define under the header stdio.h
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| − | | 01.18
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| − | |(star) *fp is a pointer to the file variable
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| − | | 01.22
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| − | |It will store all the information about the file like its name, status and current information.
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| − | | 01.30
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| − | |Let us go back to our slides.
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| − | |01.33
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| − | |Now, we will see the syntax to open a file.
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| − | |01.37
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| − | |Here, the fopen function opens a stream then it link the file with the stream.
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| − | |01.44
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| − | |File name is the name of the file that we want to open or create.
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| − | |01.49
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| − | |We can give the path along with the filename and we can also give the extension.
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| − | |01.56
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| − | |Here we can give the mode of the file.
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| − | |01.59
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| − | |Let us see the type of the modes
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| − | | 02.02
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| − | |w- creates file for read and write.
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| − | | 02.06
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| − | | r- opens file for reading
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| − | | 02.09
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| − | |a- writing at the end of the file.
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| − | | 02.12
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| − | | Now, come back to our program
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| − | | 02.14
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| − | | Here we create a sample.txt file in write mode
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| − | | 02.20
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| − | | We can see that the path is given, our file will be created on the desktop.
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| − | | 02.26
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| − | |Then we write the statements into the file.
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| − | | 02.29
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| − | |Welcome to the spoken tutorial and This is an test example.
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| − | | 02.34
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| − | |fprintf writes output to the given output stream
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| − | | 02.39
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| − | |fclose closes the file associated with the stream.
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| − | | 02.43
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| − | |And this is our return statement.
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| − | | 02.46
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| − | |Now click on Save.
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| − | | 02.48
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| − | |Let us execute the program.
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| − | | 02.50
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| − | | Open the terminal window by pressing Ctrl, Alt and T keys simultaneously on your keyboard.
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| − | | 02.59
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| − | | To compile type gcc space file.c space hyphen o space file, press Enter
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| − | | 03.08
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| − | |To execute type (dot slash)./file . Press Enter
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| − | | 03.12
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| − | |We see the file is executed
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| − | | 03.15
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| − | |Now we will check it out
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| − | | 03.17
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| − | |Let us open the home folder
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| − | | 03.19
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| − | |Click on the home folder option.
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| − | | 03.22
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| − | |Now click on the desktop option.
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| − | | 03.26
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| − | |Here is our sample.txt file
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| − | | 03.28
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| − | |This shows that our file is successfully created
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| − | | 03.32
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| − | | Now, let us open. Double click on the file.
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| − | | 03.36
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| − | | We can see the messages here.
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| − | | 03.38
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| − | |Welcome to the spoken tutorial. This is an test example.
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| − | | 03.43
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| − | |This is how, we create a file and write data into it.
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| − | | 03.48
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| − | |Now, we will see how to read data from a file
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| − | | 03.52
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| − | |I have already made the program. I will open it.
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| − | | 03.55
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| − | |In this program we will read our sample.txt file and print the message on the console.
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| − | | 04.02
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| − | |In this program we will read data from our sample.txt file and print the data on the console
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| − | | 04.10
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| − | |Let me explain the code now.
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| − | | 04.12
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| − | |This is our header file.
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| − | | 04.15
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| − | |This is our main function
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| − | | 04.17
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| − | |Here a file variable and the pointer to the file variable is defined.
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| − | | 04.22
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| − | |Then we have declared a character variable c
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| − | | 04.26
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| − | |Here we open the file sample.txt in read mode.
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| − | | 04.31
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| − | |The output is stored in fp
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| − | | 04.34
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| − | |Then we check the condition
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| − | | 04.36
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| − | |if fp is equal to null, if the condition is true then we print the message File does not exist.
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| − | | 04.45
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| − | | else it will check for another condition.
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| − | | 04.48
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| − | |while c is not equal to EOF
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| − | | 04.53
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| − | |Here EOF is a end of file
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| − | | 04.56
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| − | |It denotes the end of input.
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| − | | 04.59
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| − | |It is a condition where no more data can be read from a datasource
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| − | | 05.04
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| − | |If the condition is true then it will display the characters from sample.txt file on the console.
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| − | | 05.13
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| − | |Here getc returns a haracter from a specified file or stream
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| − | | 05.19
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| − | |Now, it will return a character from our sample.txt file.
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| − | | 05.24
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| − | |putchar is used to display a character on the console.
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| − | | 05.28
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| − | |Then it will store the characters in variable C
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| − | | 05.32
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| − | |Here we close the file
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| − | | 05.35
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| − | |And this is our return statement.
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| − | | 05.37
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| − | |Now click on Save.
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| − | | 05.39
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| − | |Let us execute the program
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| − | | 05.41
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| − | |Come back to our terminal
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| − | | 05.44
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| − | | To compile type gcc space readfile.c space hyphen o space read, now press Enter
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| − | | 05.54
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| − | | To execute type (dot slash)./read .
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| − | | 05.59
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| − | |The output is displayed as Welcome to the spoken tutorial
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| − | | 06.02
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| − | |This is an test example.
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| − | | 06.05
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| − | |This brings us to the end of this tutorial.
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| − | | 06.08
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| − | |Come back to our slides
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| − | | 06.10
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| − | |Let us summarize.
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| − | | 06.11
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| − | |In this tutorial we learnt
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| − | |File handling
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| − | | 06.15
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| − | |To write data into a file.
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| − | | 06.17
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| − | |example fp = fopen Sample.txt comma w
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| − | | 06.24
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| − | |To read data from a file example fp = fopen Sample.txt comma r
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| − | | 06.32
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| − | |As an assignment,
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| − | | 06.33
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| − | |Write a program to create a file TEST
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| − | | 06.36
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| − | |Write your name and address in the file TEST
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| − | | 06.40
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| − | |Then display it on the console using C program
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| − | | 06.44
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| − | |Watch the video available at the link shown below
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| − | | 06.47
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| − | |It summarizes the Spoken Tutorial project
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| − | | 06.50
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| − | |If you do not have good bandwidth, you can download and watch it
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| − | | 06.54
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| − | |The Spoken Tutorial Project Team
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| − | | 06.56
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| − | |Conducts workshops using spoken tutorials
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| − | |07.00
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| − | |Gives certificates to those who pass an online test
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| − | | 07.04
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| − | |For more details, please write to, contact@spoken-tutorial.org
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| − | | 07.10
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| − | |Spoken Tutorial Project is a part of Talk to a Teacher project
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| − | | 07.14
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| − | |It is supported by the National Mission on Education through ICT, MHRD, Government of India
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| − | | 07.21
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| − | |More information on this Mission is available at the link shown below
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| − | | 07.26
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| − | | This is Ashwini Patil from IIT Bombay signing off
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| − | | 07.29
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| − | |Thank You for watching.
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