HP -225 Owner's Manual page 44

Reusing the Previous Result ([LAST))
When you start a new calculation, a copy of the most recent result is
stored in the LAST register. To recall that value to the display, press
B(CAST]. For example, LAST shortens the following two calculations:
0821 x (18+273.1)
13
2
+ .0821 x (18 + 273.1)
Keys: Display: Description:
.0821 18 First result.
273.1 (5] 23.8993
2 13 B[LAST] +23.8993 B(LASTrecalls the pre-
vious result.
(=] 25439 Second result.
Swapping the Displayed Number With the
Previous Number
B(SWAP] exchanges the last two numbers you've keyed in during a
calculation. For example, if you've keyed in 44 75, [[SWAP] re-
verses the order of the numbers to 75 <+ 44. Pressing [SWAP again
restores 44 + 75.
Keys: Display: Description:
44 75 + 75 Oops! You meant to
key in 75 + 44.
B(swar +44,0000 Swaps the 75 and 44.
=) 1.7045 Completes the
calculation.
36 2: Arithmetic and Variables