Texas Instruments TI-99/4A - Restore

RESTORE
RESTORE #fjle-numberi .REC num eric-expressionI
(For' a dC3Cription of the RESTORE statement used with the
READ and DATA statements. see "Input-Output Statements. ")
The RESTORE statement repositions an open file at its beginning
record (see the first
example on the right). or at a specific record if
the file is RELATIVE (see the second example on the right).
If the
file-number specified in a RESTORE statement is not
already open. the program will terminate with the message "FILE
ERROR IN xx."
You may use
the REC clause only with a RELATIVE file. The
computer evaluates the numeric·expression following REC and
uses the value as a pointer to a specific record on thc file. If you
RESTORE a RELATIVE file and do not use the REC clause. the
file will be set to record O.
If there is a pending PRINT record. the record will be written on
the file before the RESTORE is performed. If there is a pending
INPUT. the data in the I/O buffer is discarded.
RELATIVE files are not supported by cassette recorders.
II·136
Examples:
>NEW
>100 OPEN #2:"CS1",SEQUENTIAL
,INTERNAL,INPUT,FIXED 64
>110
INPUT #2:A,B,C$,D$,X
• program lines
·
>400 RESTORE #2
>410 INPUT #2:A,B,C$,D$,X
• program Lines
>500 CLOSE #2
>510 END
>NEW
>100 OPEN #4:NAME$,RELATIVE,I
NTERNAL,UPDATE,FIXED 128
>110
INPUT #4:A,B,C
_ program Lines
>200 PRINT #4:A,B,C
• program Lines
>300 RESTORE #4,REC 10
>310 INPUT #4:A,B,C
• program llnes
>400 CLOSE #4
>410 END
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