stdio.h

Type Definitions

Typedef	Datatype	Description
size_t	unsigned int	Result of the sizeof keyword.
FILE	object	Suitable for storing information for a file stream.
fpos_t	object	Suitable for storing any position in a file.

Methods

Return	Method
int	printf( const char *format, ... )
int	puts( const char *str )
int	scanf( const char *format, ... )
char*	gets( char *str )
FILE*	fopen( const char *filename, const char *mode )
int	fclose( FILE *stream )
size_t	fwrite( const void *ptr, size_t size, size_t nmemb, FILE *stream )
int	fprintf( FILE *stream, const char *format, ... )
int	fputc( int char, FILE *stream )
int	fputs(const char *str, FILE *stream)
size_t	fread( void *ptr, size_t size, size_t nmemb, FILE *stream )
int	fscanf( FILE *stream, const char *format, ... )
int	fgetc( FILE *stream )
char*	fgets( char *str, int n, FILE *stream )
int	fseek( FILE *stream, long int offset, int whence )
long int	ftell( FILE *stream )
void	rewind( FILE *stream )

Method Descriptions

int printf( const char *format, ... )

Sends formatted output to stdout.

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int puts( const char *str )

Writes a string to stdout up to but not including the null character. A newline character is appended to the output.

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int scanf( const char *format, ... )

Reads formatted input from stdin.

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char *gets( char *str )

Reads a line from stdin and stores it into the string pointed to by, str. It stops when either the newline character is read or when the end-of-file is reached, whichever comes first.

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FILE *fopen( const char *filename, const char *mode )

Opens the filename pointed to by filename using the given mode.

Parameter	Description
filename	string containing the name of the file to be opened.
mode	string containing a file access mode.

mode	Description
"r"	Opens a file for reading. The file must exist.
"w"	Creates an empty file for writing. If a file with the same name already exists, its content is erased and the file is considered as a new empty file.
"a"	Appends to a file. Writing operations, append data at the end of the file. The file is created if it does not exist.
"r+"	Opens a file to update both reading and writing. The file must exist.
"w+"	Creates an empty file for both reading and writing.
"a+"	Opens a file for reading and appending.

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int fclose( FILE *stream )

Closes the stream. All buffers are flushed.

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size_t fwrite( const void *ptr, size_t size, size_t nmemb, FILE *stream )

Writes data from the array pointed to by ptr to the given stream.

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int fprintf( FILE *stream, const char *format, ... )

Sends formatted output to a stream.

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int fputc( int char, FILE *stream )

Writes a character (an unsigned char) specified by the argument char to the specified stream and advances the position indicator for the stream.

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int fputs( const char *str, FILE *stream )

Writes a string to the specified stream up to but not including the null character.

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size_t fread( void ptr, size_t size, size_t nmemb, FILE *stream )

Reads data from the given stream into the array pointed to by ptr.

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int fscanf( FILE *stream, const char *format, ... )

Reads formatted input from a stream.

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int fgetc( FILE *stream )

Gets the next character (an unsigned char) from the specified stream and advances the position indicator for the stream.

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char *fgets( char *str, int n, FILE *stream )

Reads a line from the specified stream and stores it into the string pointed to by str. It stops when either (n-1) characters are read, the newline character is read, or the end-of-file is reached, whichever comes first.

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int fseek( FILE *stream, long int offset, int whence )

Sets the file position of the stream to the given offset.

int	whence	Description
1	SEEK_SET	Beginning of file
2	SEEK_CUR	Current position of the file pointer
3	SEEK_END	End of file

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long int ftell( FILE *stream )

Returns the current file position of the given stream.

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void rewind( FILE *stream )

Sets the file position to the beginning of the file of the given stream.

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