Glossary
Reserved
word
- in
programming
languages,
a
special
word
with a predefined meaning. A
reserved
word
must
'be
spelled
correctly.
appear
in the
proper
order
in a
statement*
or
command*,
and
cannot
be
used
as 3 variahlF*
name.
ROM
- read-only
memory:
certain
instructions
for the
computer
are
permanently
stored
in
ROM
and
caIl be
accessed
but
cannot
he
changed.
Turning
the
power
off does not
erase
ROM.
Run
Mode
-
when
the
computer
is executing* a
program.
it is in
Run
Mode.
Run
Monf'
is
terminated
when
program
execution
ends
normally
ur
abnormally. You can
cause
the
computer
to leave
Run
Monp
hy
prpssinp;
CLEAR
during
program
execution
(see Breakpoint*).
Scientific
notation
- a
method
of
expressing
very large
or
very
small
numbers
by
usmg
a
base
number
(mantissa*) times ten
raised
to
Some
power
(exponent*). To
represent
scientific
notation in
TI
BASIC,
enter
the sIgn,
then
the
mantissa,
the
letter
E,
and
the
power
of
ten
(preceded
by
a minus sign if negative}.
For
example.
3.2b4E4;
-
2.4
7E
-17.
Scroll
- to move
the
text
on
the
scrccn
so
that
additional
information
can
be
displayed.
Software
- various
programs
which
are
executed
by the
computer,
including
programs
built into
the
computer,
Command
Module'"
programs,
and
programs
entered
by the user.
Statement
-
an
instruction
prt>rt>clt>cl
hy
;'I
line
number
in a
program.
IN
TI
BASIC.
only
one
statement
is allowed in a program line*.
String
- a series
of
letters.
numbers,
and
symbols
treated
as a unit.
*See definition in Glossary.
lV-4
Subprogram
- a predefined
general-purpose
procf:dun:
accpssihk
to
tlw
USf:T
through the
CALL
statement
in
TI
BASIC.
Subprograms
extend
the
capability
of
BASIC
and
cannot
be
PAsily
progr<lmllw.c1
in
BASIC
Subroutine
- a
program
segment
which
can
be
used more
than
once
during
the execution*
of
a
program.
such
as
a
complex
set
of
calcula
lions
or
a print routine. In
TI
BASIC.
a
subroutine
is
entered
by a
GOSUB
statement
and
ends
with a
RETURN
statement.
Subscript
- a
numeric
expression
which
specifies a
particular
item in
an
array*' In
Tl
BASIC
the
subscript
is
written
in
parentheses
immediately following;
the
array
name.
Trace
- listing the
order
in
which the
computer
performs
program
statements.
Tracing
the line
numbers
can
help you tind
errors
in a
program
flow.
Underflow
- the condition which
occurs
when
thp cllJnputtor
generates
a
numeric
value
grcater
than
- 1E - I 28. less than 1E - 128, and not
zero. When
an
underflow
occurs,
the value
is
n'pl:wPd hy zprn
Variable
- a nallle given to a value which may
vary
during
program
execution. You
can
think
of a
vanable
as
a
memory
locatlon
where
values
can
be
replaced
by
new
values
during
program
execution
Variable-length
records
-
records
in a
f1Ie*
which vary in length
depending
on the
amount
of
data* pt'r
record*
Using
variable-length
records
conserves
space
on
a file. Variable-
length
records
can
only be
accessed
<:,pquentially
U5cr's
Reference
Guide
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