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Use SUB is used to define a subprogram.
Syntax
SUB
sub-identifier[
I
furmal-list
I) [EXPORT)
sub-body:
where
sub-idenlifier
is
a name
sub-body
is a sequence of BASIC 2 Plus statements,
separated
with colons or
new
lines in the usual way.
SWAP
(see
Chapter 2)
Use SWAP exchanges
the
values of two general variables.
Syntax
SWAP
general—variable, general—variable
SYSTEM
(see User
Guide
Chapter 1)
Use SYSTEM takes you out of BASIC 2 Plus. (See also QUIT.)
Syntax SYSTEM
TAN
(see Chapter 3)
Use
TAN
is a function which returns the tangent of its argument.
Syntax
TAN)argument)
where
argument is
a
numeric-expression.
TEST
(see Chapters 9 & 12)
Use TEST is a function
which
returns
the
colour of a point on
a
Graphics Screen.
Syntax
TEST)[I/stream-nomber, I point)
TEXT
(see Chapter 11)
Use TEXT pertonns various operations available on text screens.
Syntax
TEXT
[I/stream-number,I
CLEAR
clear-area
or
TEXT
[I/stream-number,I
DELETE [LINE)
or
TEXT
[I/stream-number,I
INSERT
[LINE)
or
TEXT
[I/stream-number,I
FEED
count
where clear-areaisoneofEOL,
DOL, LINE, EOS, BOS, SCREEN
count is an integer-expression.
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