Laser 128 - Gosub

BASIC COMMANDS AND STATEMENTS
3.16 GOSUB ... RETURN
Purpose:
Format:
To direct the program flow into,
and return from, a subroutine.
GOSUB linenumber
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•
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RETURN
Comments: A subroutine may be called any
number of times from within a
program, and it is possible to
call another subroutine from
within a subroutine, which, in
turn, may call another
subroutine. Nesting of
subroutines can be 25 levels
deep. The linenumber needed in
the GOSUB statement is the
first line of the subroutine .
The RETURN statement
terminates the execution of the
subroutine, and returns the
interpreter to the line
immediately following the most
recent GOSUB statement.
However, there is no way that
the interpreter can distinguish
between a subroutine and
ordinary program lines. So, to
a void executing the subroutine
when it is not required, you
sho uld put a GOTO, STOP, or
END in the line before it starts.
II-44