Apple IIe - Page 105

Apple
BASIC
Reference Gui
de
105
•
Applesoft
GOSUB,
RETURN
•
Integer
The
GOSUB, RETURN
statements are used
to
branch
to
a
subroutine
and
then
return
from
it.
)
f"
•
Con
1gurat1on
GOSUB
li
ne
RETURN
line
is
the
first
line
of
a
subrout
i
ne
.
In
Applesoft
,
the
GOSUB
will
branch
to
line
0
if
line
is
omitted
or
an expression is used.
In
Integer
BASIC,
line
can
be
an expression,
where
the
expression
evaluates
to
a
line
number
of
a
subroutine.
A
subrout
i
ne
is
called
by
the
GOSUB
statement.
When
the
RETURN
statement
is
encountered
within
that
subroutine
,
program
control
will
branch
back
to
the
statement
following
tbe
GOSUB
statement
just
executed
.
Subroutines
may
appear
at
any
point
within
the
program.
However,
it
is
good
programm
i
ng
practice
to
group
all
sub-
routines
near
the
beginning
of
the
program.
Example
10
GOTO
60
20
PRINT
X,
30 Y
=
X*X
40
PRINTY
50
RETURN
60
X
= O
70
FOR I = 1
TO
3
80 X
=
X+1
90
GOSUB
20
pr
og
r
am
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