Radio Shack TRS-80 User Manual page 22

Now
suppose
we want
to include both the value of
something
and some
exact
words on
th
same
line.
Pay
attention, as
you
will
be doing
more
and more
program
design yourself,
and
PRINT
statements
give
beginners
more
trouble than any
other
single
part of
computer
programming.
Type
in the following:
50
PRINT
"THE
DISTANCE
(IN
MILES)
IS",D
EZH33
Then
run anna
The
display
should
appear:
THE DISTANCE
(IN MILES)
IS
3000
(REMEMBER:
Typing
hi
a statement with a
Hue
rramber
that already
Is
ih
use
erases the original
'
statement uritirety -~ and
that's
what
we
want
to
.;
do
here,)
How
about
that!
The
message enclosed
in
quotes
is
printed exactly
as
we
specified,
and the
letter
gave us the value of D.
The
comma
told
the
Computer
that
we
wanted
it
to print
two
separate items
on
the same
line.
We
can
tell it
to print
up
to
four items on
the
same
line,
simply
by
inserting
commas
between them.
With
this in
mind,
see
if
you
can change
line
5(3
so the
computer
finishes
the program with
the following
message:
THE
DISTANCE
IS
3000
impm
MILES,
Break
up
the
quoted
message
into
two
parts,
and put
the variable
in
between
them on
the
PRINT
line.
50
PRINT
"THE DISTANCE
IS"
,
D
,
"MILES."
Now
what about
all
that extra space
on
the printout line?
The
reason
for
it is
that the
com-
puter
divides
up
the screen width
into four zones of
15
characters each.
When
a
PRINT
statement
contains
two
or
more
items separated
by commas,
the
computer
automatically
prints
the items
in different print zones.
Automatic
zoning
is
a very
convenient method
of
outputting tabular information, and
we'll
explore the subject further
later on.
It's
possible to
eliminate
all
that extra space
in
the output from our
Distance, Rate,
Time
program.
Retype
the
last
version
of
line
50, substituting
semi-colons
(;)
for
commas
throughout
the
line.
run
Bzngj
The
display should appear:
20
jJGarefui
—
don^fc
renUjqe the
perfftcf
'With
««emi*
'
eoloiu),
..:'.....
„...;:.,.„.
..,...;
.'....:':.
''•':
t-'--