Radio Shack TRS-80 - 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