98
The
VIC 20
User
Guide
This statement branches in the same way as a GOTO, but GOSUB
remembers the line number to which it should return. This
is
illustrated in
the following section.
GOSUB
STATEMENT
110
GOSUB
2000
110
\
I
I
Subroutine
)000
I
-start
I
I
2150
RETURN-end
\
\
\
\
\
\
\
\
""
,
'
...
..................
;",'/
#'
\
I
I
,
I
I
/
/
The RETURN statement causes a branch back to the line number that
the GOSUB statement remembered. The three-statement loop
that
initializes array A(I), if converted into a subroutine, would appear as
follows:
113
REM
MAIN
PROGRAM
20
REM
',.'OIJ
eRN
DIMENSION
A
SUBROIJTINE'S
VARIABLE
IN
THE
MAP~
313
REM
PROGRAM.
IT
IS A
GOOD
IDEA
TO
DIMEtJSIOtJ
ALL
'.lARrABLES
50
REM
AT
THE
START
OF
THE
MAIN
PROGRRM.
613
DIM
A(99)
713
OOSUB
2131313
813
REM
DISPLAY
SOMETHING
TO
PROVE
THE
RETUR~1
OCCURRED
913
PRINT"RETURNED"
lee
OOTO
lee
2131313
REM
SUBROUTINE
213113
FOR
1=13
TO
99
213213
A(
1)"1
213313
PRINT
A(
l)
,;
213413
NEXT
I
213513
RETURN
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