Radio Shack TRS-80 - Page 127

We
obviously used a FOR-NEXT
loop
to READ
10
DATA elements,
and named
those
elements
(or
"cells")
in which
they're
stored,
A(l)
through A(10).
Let's see if
we can
PRINT out the values in those
array
elements.
Type:
200 FOR N
=
1 TO
10
210
PRINT A(N)
220 NEXT N
.
.
. and RUN.
Aha! It works, but
how?
We read the
DATA elements
into
an array called
A(L), but printed
them
out of an array called
A(N). What gives?
Oh, nothing, really.
The array's
name
is
"A".
The
location of each data element
within that array
is
identified by the
number
which we
place
inside the parentheses. We
can
bring that number
to inside the
parentheses
by using
any
of our
26
letter
variables, and
can
even do some simple
arithmetic
inside
those
paren-
theses if
we wish.
Remember,
though, there
is only
one array,
and its name
is "A".
Its elements
are
numbered,
and
called A-sub (number).
Let's work some more
on
the
program.
Type:
170 PRINT
180
PRINT
"LICENSE
#",
"ENGINE SIZE"
210 PRINT
N,A(N)
. . . and
RUN
.
Now that's more like
it.
We have every license
number, every
engine
size, and are
not
"using
up" any of the
26
alphabetic
variables.
Having
demonstrated
that point, erase lines
20(5,
210
and
220,
and type:
10
IN.
"WHICH CAR
'
S ENGINE SIZE
DO
YOU WANT
TO KNOW";W
2 10 PRINT
W.A(W)
... and
RUN.
Some
pure
mathematicians
might
insist
on catling
A{X)
-
A "OF"
X.
Who
needs that added
conftision?
Best 'teat
you
know,
just
in'
*s$& ;
:
M
125