File oparation in c

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4. TOPIC
File operations in C

5. File operations
We frequently use files for storing information
which can be processed by our programs. In
order to store information permanently and
retrieve it we need to use files.
Files are not only used for data. Our program
are also stored in files.

6. • In C we use FILE * to represent a pointer to a
file.
• fopen is used to open a file. It returns the
special
• value NULL to indicate that it couldn't open
the file.

7. Modes for opening files
The second argument of fopen is the mode in
which we open the file. There are three
• "r" opens a file for reading
• "w" creates a file for writing - and writes over
all previous contents (deletes the file so be
careful!)
• "a" opens a file for appending - writing on the
end of the file
• “rb” read binary file (raw bytes)
• “wb” write binary fil

8. Writing to a file using fprintf( )
fprintf( ) works just like printf and sprintf
except that its first argument is a file pointer.

9. Reading Data Using fscanf( )
We also read data from a file using fscanf( ).

10. Closing a file
We can close a file simply using fclose( ) and
the file pointer.

11. Example of File operations

12. THE END
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