HP 12C Platinum User Manual page 133

RPN program notes: We'll key the income into the display before running the
program so that it will be in the X-register when the :0 instruction in program
line 001 is executed. This instruction will place the test value 20,000 in the
X-register and (as explained in Appendix A) move the income into the Y-register.
The ~ instruction in program line 002 will exchange the numbers in the X- and
Y-registers (as also explained in Appendix A): that is, it will place the income back
into the X-register and place the test value into the Y-register. This is necessary
because when either the :2 instruction in line 005 or the :1 instruction in
line 007 is executed, the number in the X-register is moved into the Y-register; if the
~ instruction were not included, the test value 20,000, rather than the income,
would be in the Y-register when the b instruction in line 008 is executed.
Keystrokes
(RPN mode)
f]
fs
fCLEARÎ
:0
~
Section 9: Branching and Looping
Display
007,43, 33, 002
000,
001, 45 0
002, 34
Sets calculator to Program mode.
(Display shows program line at
which execution was halted at
end of preceding example.)
Clears program memory.
Recalls test value into X-register
and places income in Y-register.
Places income in X-register and
test value in Y-register.
133