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HP HP-21 - EEX and y

HP HP-21
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Controlling
the
Display
23
digit
mantissa
and
a
two-digit
exponent
of
10.
In
a
few
cases,
a
number
may
have
to
be
altered
slightly
in
form
before
you
can
key
it
in
using
the
@
key:
If
you
key
in
a
number
whose
mantissa
contains
more
than
eight
digits
to
the
left
of
the
decimal
point,
the
B2
key
is
overridden
and
does
not
operate.
Begin
again
and key
in
the
number
in
a
form
that
displays
the
mantissa
with
eight
digits
or
less
to
the
left
of
the
decimal
point
before
pressing
the
B
key.
(Thus,
123456789.1
x
1023
could
be
keyed
in
as
12345678.91
x
10%))
If
you
key
in
a
number
whose
first
significant
digit
occurs
after
the
first
eight
digits
of
the
display,
the
EEdkey
should
not
be
used.
To
key
in
the
number
correctly,
begin
again
and
place
the
number
in
a
form
such
that
its
first
significant
digit
is
one
of
the
first
eight
digits
of
the
display,
then
pro-
ceed
using
the
key.(Thus,
0000.000025
x
10°°>
must
not
be
keyed
in in
that
form.
It
could
be
keyed
in
as
0000.00025
X
1054,
or
as
0.000025
x
10°>,
for
example.)
E2
and[>7]
Do
not
confuse
the
use
of
the
EZY(enter
exponent
)
key
with
the
key.
is
used
to
specify
the
power
of
ten
by
which
a
number
is
multiplied.
is
used
to raise
a
number
to
a
power.
For
example,
compute
the
cube
of
Avogadro’s
number:
(6.02
X
1
023).'}
.
Press
Display
6.02
23
6.0200000
23
3
3
]
2.1816721
x
107
is
the
cube
of
Avogadro’s
number.

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