Radio Shack TRS-80 Model III - Page 23

OPERATION
Program
Line
A program line
consists
of a line number
in
the
range
[0,65529],
followed
by one or
more
statements
separated
by colons.
When
you
press
(ENTER)
, the line is stored
in
the program
text area of memory
,
along
with any
other lines
you
have
entered
this
way
.
The program is
not executed
until
you
type RUN
or
another
execute
command
.
For
example:
1
00
CLS: PRINT
"THE SQUARE
ROOT OF 2 IS"; SQR(2)
is a
program line. When
you press
(ENTER) . BASIC stores it
in the program
text area.
To execute
it,
type:
RUN
(ENTER)
Special
Keys
in
the
Immediate
Mode
CD
The question
mark can
stand for the
commonly
used keyword
PRINT.
For example,
the immediate line:
? "HELLO."
is
the
same
as
the immediate
line:
PRINT
"HELLO."
Note: L?
does
not mean LPRINT.
This
abbreviation
can be
used in a program,
too.
O
The period can
stand for
' 'current program
line
",
i
. e
.,
the last
program
line
entered or edited.
The period
can be used
in most
places
where
a line
number would normally
appear.
For example,
the immediate
line:
LIST.
tells
BASIC to list
the current
program line.
CD
The
single-quote
tells BASIC
to ignore
the rest of the logical
line.
It
is an
abbreviation
for
the BASIC keyword
REM. When
used in a
multi-statement
line, it
does not have
to be preceded
by a colon.
For
example,
when
you type in
the line:
PRINT
1 +
1;
'2
+ 2
BASIC
will print
the sum 1
+
1
but not
2 +
2
.
This
abbreviation
can be used in
a program,
too.
(SHIFT)CDCD
Causes
the Computer
to print
the Display contents
to the line
printer,
if available.
Press
(BREAK)
to
interrupt
this operation . This
key
sequence works
in
the other modes
too. Note: You must use
the lefthand
(SHIFT)
kev.
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