Commodore 1581 - Reading File Data: Using INPUT#

FORMAT FOR THE CLOSE STATEMENT
BASIC 7.0: DCLOSE#file# [,Udevice#]
BASIC 2.0: CLOSE file #
where "file #" is the same file number given in the desired file's cur
rent OPEN statement.
EXAMPLES:
To close the data file #5 used as an example on the previous page, use:
BASIC 7.0: DCLOSE#5
BASIC 2.0: CLOSE 5
In BASIC 7.0, when the DCLOSE statement is used alone (no# or
file# parameters), it closes all disk files at once. With a bit of planning,
the same can be done via a program loop. Since there is no harm in
closing a file that wasn't open, close every file you even think might be
open before ending a program. If you always gave your files numbers
between 1 and 5, you could close them all with
9950 FOR 1 = 1 TO 5
9960 CLOSE I
9970 GOSUB 59990:REM CHECK FOR DISK ERRORS
9980 NEXT I
assuming your program includes an error check subroutine like the
one in the last chapter.
READING FILE DATA: USING INPUT#
Once information has been written properly to a diskette file, it
may be read back into the computer with an INPUT# statement. Just as
the PRINT# statement is much like the PRINT statement, INPUT# is
nearly identical to INPUT, except that the list of items following the
command word comes from a particular file instead of the keyboard.
Both statements are subject to the same limitations—halting input after
a comma or colon, not accepting data items too large to fit in BASIC'S
input buffer, and not accepting non-numeric data into a numeric vari
able.
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