HP 48G User Manual
Page 31
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
This
process
of entering
numbers
onto
the
stack and
using numbers
fronr tlie stack during calculations underlies everything the HP 48
does. This apirroach makes it easy for the calculator to work very
efficiently because the results
of one
calculation are
left sitting
on
the
top of the stack ready to be used by aii}^ otJier command.
Example:
Divide tlie ])revious result by 1.3. The numerator—tlie
result of the
previous
calculation
—is
already entered,
so
von only need to enter the denominator and divide.
.3 f
enter
! 0
l!
1.30769230769
The
next
few examjdes use
a
keystroke-saving
shortcut
that you
haven't
seen yet. When
calculating with
the
stack, "mathematical”
keys, such as f+1, causes an automatic
fENTER
) before it executes its
action. This allows you to use the setpience. 8.9
f ENTER
) 7 -.2
0
inst.ead
of 8.9
[ENTER)
7.2
[ENTER)
0, to subtract 7.2 from 8.9. In short, it
saves you a keystroke.
Work
the
following short
examples
of stack arithmetic that
use
the fourth-row mathematical keys. Notice in particular how each
operation
leaves
the
results ready
for
the
next operation.
Example:
(.'aleniate -,
92.3 (IQ
1
:
.016
Example:
Calculate 20
20 [ENTER) 2 (Q! [F3
1
:
.0025
Examph'- C.'aJculate
4 (ENTER)2 (ENTER)3
1
:
350.174049835
Arithmetic 3-3