File Streams Syntax

Syntax: void open(char *filename, int open_mode, int access)

where:filename is the name of the file
open_mode determines why the file is opened. The open_mode must be one of the following:

open_mode	Meaning
ios::app	open file for output and seek to the end of the file
ios::ate	seek to the end of the file after opening it
ios::in	open file for input (default for ifstreams)
ios::nocreate	if file does not exist, then fail the open
ios::noreplace	if file already exists, then fail the open
ios::out	open file for output (default for ofstreams)
ios::trunc	if file exists, then truncate its contents. (default for ios::out)

access determines how the file can be accessed. It must be one of the following:

Attributes	Meaning
0	normal file - open access
1	read-only file
2	hidden file
4	system file
8	archive bit set

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