Numbers
with
decimal point:
0.5
0.0165432
-0.0000009
1.6
24.0055
-64.2
3.1416
Note
that
if vou
put
commas in a number and ask the
PET
ta
print it. vou
will
get
a Syntax Error message. For example. vou
must
use 65000. not 65.000.
Roundoff
Numbers
always
have
at
least eight digits
of
precision; they ean have
up
to nine, depending
on
the number. The PET rounds off any additional sig-
nifieant digits.
It
rounds up when the next
digit
is
five or more; it rounds
down
when the next
digit
;s
four or
less.
Roundoff
will
sometimes cause fractional numbers
ta
look inaccurate. Here
are sa
me
examples:
"?
5555555556
.555555555
t~---Appears
ta
round down
on
6 or
less.
up
on
7
or
more.
~
~~~~~~~~~LJ'
;'
•
,_1._1
_'._I._I._I._I::.J,_,
..
.
555555556
?1111111115
.111111111
t Appears
ta
round down
on
5 or
less.
up
on
6 or more.
?
11111111
~.6
1
.11111111~
These quirks result from the manner in
which
computers store floating
point
numbers.
Seientific Notation
Floating
point
numbers can also
be
represented in scientific notation.
When
numbers
with
ten
or
more digits are entered, the PET automatieally eonverts
them to seientifie notation.
Scientific notation allows the
PET
ta accurately dis-
play these large numbers
in
a smaller number of spaces. For example:
F:EAD'T'.
?1111111114
1 •
11111111
E+(19
54
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