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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.

Syntax for Closing Files

Closing an Input File

Close_Input [channel {channel-num.}]

Closing an Output File

Close_Output [channel {channel-num.}]

Parameters

  • {channel-num.}: 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.