File Management functions

A File can be used to store a large volume of persistent data. Like many other languages ‘C’ provides following file management functions:

1. Creation of a file
2. Opening a file
3. Reading a file
4. Writing to a file
5. Close

Functions	Syntax	Description
fscanf( )	int fscanf (FILE *stream, const char *format,....);	It is used for reading the formatted data from the stream.
fgets( )	char *fgets(char *str, int size, FILE *stream);	It stands for file get string. It is used for getting the string from a stream.
fgetc( )	int fgetc (FILE *stream);	It will return the next character from the stream from the end of the file or an error.
fread( )	int fread(void *str, size_t size, size_t num, FILE *stream);	It is used for reading data from a file.

Following are the list of functions which are used for writing a file:

Functions	Syntax	Description
fprintf()	int fprintf (FILE *stream, const char * format,...);	It is used for writing the formatted output of the stream.
fputs()	int fputs(const char *str, FILE *stream);	It is used for writing a line to a file.
fputc()	int fputc(int c, FILE *stream);	It is opposite to fgetc() and is used for writing a character to the stream.
fwrite()	int fwrite(const void *str, size_t size, size_t count, file *stream);	It is used for writing data to a file.

Following are the functions which are used for detecting the errors:

Functions	Syntax	Description
clearerr()	void clearerr(FILE *stream);	It is used for clearing the end-of-file and error indicators for the stream.
perror()	void perror(char *msg);	It stands for the print error.

Closing a file :

After every successful file operation, always close a file.

For closing a file, fclose function is used.

Ex:

filePointer= fopen(“fileName.txt”, “w”);

---------- Some file Operations -------

fclose(filePointer)