HP (Hewlett-Packard) Calculator HP 12C Financial Calculator User Manual

4.7

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132 Section 9: Branching and Looping
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 132 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
Keystrokes
(RPN mode)
Display
go
003, 43 34
Tests whether number in X-re
g
ister
(income) is less than or equal to
number in Y-register (20,000).
gi
007
004,43, 33, 007
If condition is true, branches to
program line 007.
:
2
005, 45 2
If condition is false, recalls 25%
tax rate to X-register.
gi
008
006,43, 33, 008
Branches to program line 008.
:
1
007, 45 1
Recalls 20% tax rate to X-register.
b
008, 25
Calculates tax.
fs
–190.22
Sets calculator to Run mode.
(Display shows results of running
of previous program.)
ALG program notes:
We’ll key the income into the display before running the
program. We’ll store it in R
9
so it will be available for the examples in the next
chapter. By keying the income into the display before running the program, we
ensure that it will be in the X-register when the
:
0 instruction in program line
002 is executed. This instruction will place the test value 20,000 in the X-register
and move the income into the Y-register. The
~
instruction in program line 003
will exchange the numbers in the X- and Y-registers: 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 007 or the
:
1
instruction in line 009 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 010 is
executed.
Keystrokes
(ALG mode)
Display
f[
fs
007,43, 33, 002
Sets calculator to Program mode.
(Display shows program line at
which execution was halted at
end of preceding example.)
f
CLEAR
Î
000,
Clears program memory.
?
9
001, 44 9
Stores income into register R
9
.

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