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HP HP-11C - Page 38

HP HP-11C
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36
Section
2:
Memory
Stack,
LAST
X,
and
Data Storage
a
new
copy
of
the
constant
is
generated
in
the
T-register,
that
is,
each
time
you
press
[x]:
1.
A
new
calculation
involving
the
X-
and
Y-registers
takes
place.
<a—(c*
x)
The
result
of
the
calculation
is
placed
in
the
displayed
X-
register
and
the
contents
of
the
rest
of
the
stack
drop.
A
new
copy
of
the
number
last
new
c¢
in
T
(in
this
case,
our
constant)
is
generated
in
T.
Since
a
new
copy
of
the
growth
factor
is
duplicated
in
the
T-register
each
time
the
stack
drops,
you
never
have
to
re-enter
it.
Press
4
to
return
the
HP-11C
to
the
4
display
format.
Alternate
Method:
Constant
arithmetic
can
also
be
performed
using
the
LAST
X
register.
To
use
this
method
to
calculate
the
result
of
the
preceding
example:
1
2.
3.
4
Key
in
the
original
population
(1,000)
and
press
[ENTER].
Key
in
the
constant
growth
factor
(1.15).
Press
[x]to
calculate
the
population
at
the
end
of
one
day.
Press
(9]
to
calculate
the
population
at
the
end
of
each
succeeding
day.

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