Radio Shack TRS-80 User Manual page 90

Line 30
READ A
as
1,
but
line
35 immediately
RESTOREd
the
DATA
LINE
TO
ITS
ORIGINAL
UNREAD
CONDITION. When
the
FOR-NEXT
loop brought
the
READ
line
around
for the
next
pass
it
again read the
first
piece of data,
which was
that
same
1.
Same
thing
with
all
successive passes.
READ
and
DATA
statements
are
extremely
common. The
RESTORE
statement
is
used
less often.
String Variables
Who
knows where some
of these seemingly unrelated
words
come
from?
If
they weren't so
important
we
could ignore them.
We
have been
using the
letters
A
through Z to indicate
numbers. They
are called
NUMERIC VARIABLES.
In
LEVEL
I
BASIC we
have
set
aside
2 additional
symbols
to indicate
STRING VARIABLES.
They
are
A$, and
B$,
pronounced
"A
String"
and
"B
String". String variables
can be assigned
to indicate Letters,
Words
and/or Combinations of
letters,
numbers and
spaces of
up
to
16
characters.
Type
NEW
,
then type
in:
10
INPUT "WHAT
IS
YDUR
NAME";AS
20
PRINT "HELLO THERE,
";A$
. .
.
and
RUN.
Hey-hey!
How's
that for a grabber?
If
that,
along with
what you have
learned
in
earlier
chapters doesn't
make
the creative juices flow,
nothing
will.
That's
Two
Two
ways we
now know
to print words.
The
first,
learned long ago,
is
to
imbed words
in
PRINT
statements (and
is
called
"printing a
string").
The
second
is
to bring
in
a word(s)
through an
INPUT
statement
(called
"inputting a
string"). If
you
can't think of the third
way,
go
back and check
the
title
heading
at
the
first
of this chapter.
Ah
yes, brilliant
student!
Ahem
.
.
.
(Reading a
string.)
Change
the
program
to
read
:
10
READ
A$
20
DATA RADIO SHACK TRS-80
30
PRINT "SEE MY FOXY"(A$
88