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26
1.6 Program Chain (CHAIN)
Next, following the data
file
control commands,
will
be an explanation of program
file
controls. The commands explained here are CHAIN (page
44)
and SWAP (page 45).
When these commands are used, the program
is
registered on the floppy disk in job
units and, while the program
is
being run, a separate program can be read-out and
control moved to it, i.e., a program can be connected (CHAIN) to a program
registered on the floppy disk, and can be read-out
(SWAP)
in
the form of a sub
routine. The CHAIN command, which connects and links the programs,
will
be
explained first.
The form of a CHAIN command can be, for example,
as
follows:
700
CHAI
N
"F01:
TeXT
2"
This statement means that the program currently within the text area
is
made NEW
(although the variable
will
be retained), the "TEXT
2"
file
registered on the floppy
disk
in
drive number 1
is
to be overlaid (that is, to overlay text areas and be read out),
and control
is
moved to the heading of that text.
When this statement
is
executed, control
will
move away from the BASIC text now
running,
newly
read out the "TEXT 2" text, and control
will
move to that heading.
When the program CHAIN
is
executed, the variable, and the function defined
by
DEF FN,
will
be transferred to the CHAIN destination program.
The CHAIN command function can be taken
as
<goto "filename"> .
.
file
"ABC"
~
file
"DEF"
-
10
PRINT "SUNDAY"
10
INPUT
A,S
,
2i
PRINT A, B
:
100
CHAIN "DEF"
r-
300
CHAIN "GHI"
When the CHAIN command
is
used, a large program (even a huge program which
exceeds the
BASIC text area) can
be
divided and,
as
shown in the figure above, can be
connected. When one program
is
finished, the data are left
as
is, and the following
programs are chained one after another.
The CHAIN command can be considered indispensable if complicated and diversified
data must be processed.
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