Closing Sequential I/O Files

Each I/O file that is opened should be closed when you have finished reading from or writing to it. Closing the file releases the channel for use with another I/O operation. It also makes the file available to be accessed by some other process.

The syntax for closing an input file:

Close_Input  [channel {channel-num.}]

And the syntax for closing an output file is:

Close_Output [channel {channel-num.}]

Where:

• {channel-num.} is the assigned channel of the file that is being closed. If the channel parameter is omitted then the default input or output channels will be closed.