HP 0012C-90001, User Manual

Page: 109 / 213

Section 9: Section 9: Section 9: Section 9: Branching and Loopin Branching and Loopin Branching and Loopin Branching and Looping gg g 109 109 109 109
File name: HP 12c+_user's guide_English_E_HDP0F12AE03_062608 - Modified.doc Page: 109 of 213
Printed Date: 2021/6/16 Dimension: 14.8 cm x 21 cm
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 01 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 02 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 05 or the
:
1 instruction in line 07 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 08 is executed.
Keystrokes Keystrokes Keystrokes Keystrokes Display Display Display Display
fs
07- 43, 33 02 Sets calculator to Program mode.
(Display shows program line at
which execution was halted at end
of preceding example.)
f
CLEAR
Î
00- Clears program memory.
:
0
01- 45 0
Recalls test value into X-register and
places income in Y-register.
~
02- 34
Places income in X-register and test
value in Y-register.
go
03- 43 34
Tests whether number in X-register
(income) is less than or equal to
number in Y-register (20,000).