Radio Shack TRS-80 User Manual page 23

THE
DISTANCE
IS
3000 MILES.
Look
carefully
at
program
line
50.
There's
no unused
space
between
the
S
in
IS
,
the D
,
and
the
M
in
MI
LES
.
But
in
the printout on
the display, there
is
a space between IS and
30
00
,
and another
space between
300
and MILES.
How
come?
Reason:
A
semicolon automatically
inserts
one
space between
the
two
items
it
is
separating.
As you do more
programming,
this
point
will
become
important.
WHEW!
Well,
we
have
already
covered more
than enough commands,
statements and math
operators
to solve myriads of problems.
Now
let's
spend some
time
actually writing programs
to
solve
problems.
There
is
no
better
way
to learn than by
doing,
and
everything covered so
far
is
fundamental
to our
success
in later Chapters.
So
don't
jump
over these
exercises
-
it's
the best way
to get
you
into the
thick of programming.
You'll find sample answers
in Part B, along with
further comments.
Math
operators?
—
they're the-,
symbols
;we
talked about
earlier.
.:-
-;
:
-;;
:,.-•... '):-::.;
':•>•:
EXERCISE
3-2:
Write
a
program which
will
find
the
time
required to
travel
by
jet
plane
from San Diego
to
Boston,
if
the distance
is
3000
miles
and
the plane
travels at 500
MPH.
EXERCISE
3-3;
If the circumference of
a
circle
is
found by multiplying
its
diameter times
it,
(3.14) write
a
program which
will
find the
circumference of a
circle
with
a
diameter of
35
feet.
21