TOPS-20 PASCAL Language Manual - Bitsavers

INPUT AND OUTPUT
When you reach the end of the file and you request a GET operation,
EOF automatically becomes TRUE, and the file buffer variable becomes
undefined. When EOF is TRUE, you cannot use the GET procedure.
P~SCAL signals a run-time error, and program execution is aborted.
Example
BEGIN
GET
(Phones);
END;
This example reads the next component of the file Phones into the file
buffer variable Phones A • EOF(Phones) must be FALSE; if it is TRUE,
an error occurs.
7.6 THE LINELIMIT PROCEDURE
The LINELIMIT procedure terminates execution of the program after a
specified number of lines have been written into a text file.
Format
where:
LINELIMIT (file variable, n);
file variable
specifies the text file to which
applies.
this limit
n
represents
indicating
written to
terminates.
a positive
the number
the file
integer expression
of lines that can be
before execution
When PASCAL initializes a text file, it specifies a large default line
limit. You can override this limit by calling LINELIMIT with your
desired value.
After the number of lines output to the file has reached the line
limit, program execution terminates.
Example
BEGIN
LINELIMIT (Debts,100);
Execution of the program terminates after 100 lines have been
into the text file Debts.
written
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