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The following four examples, using an APL shared variable named EXAMPLE,
show how the information required to open a data file or specify printer output
can be entered:
1. EXAMPLE~'IN 1001 ID=(TEST)
L
LThe value TEST will be compared
to the file header field.
File 1
on tape unit 1 is to be opened.
Data is to be transferred from tape
into the active workspace.
2 EXAMPLE~'OUT 003 ID=(TEST2) TYPE=I'
L
t Exchange data format"
is to be used.
The value TEST2 will be placed
in
the device header field.
File 3
on tape unit 1 (assumed) is to be opened.
Data is to be transferred to tape
from the active workspace.
a EXAMPLE~'ADD 3'
L lFile 3 on tape unit 1 (assumed) is to be opened.
Data is to be transferred into an existing file on tape.
Note: Since the file I D was not specified, no value is compared to the file
header field.
4. EXAMPLE~'PRT MSG=OFF'
1 LNO error messages will be displayed
~ for nonzero return codes.
Data is to be printed.
After the information has been entered, a code (2-element vector) that indicates
whether the operation was successful or not is assigned to the shared variable. A
return code of 0 0 indicates the operation was successful, and a nonzero return
code indicates that the operation failed. See Return Codes in this chapter for a
description of each return code.