Section 9: Branching and Looping 133
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 133 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
Keystrokes
(ALG mode)
Display
:
0
002, 45 0
Recalls test value into X-register
and places income in Y-register.
~
003, 34
Places income in X-register and
test value in Y-register.
§
004, 20
Prepares for multiplication.
go
005, 43 34
Tests whether number in X-re
ister
(income) is less than or equal to
number in Y-register (20,000).
gi
009
006,43, 33, 009
If condition is true, branches to
program line 009.
:
2
007, 45 2
If condition is false, recalls 25%
tax rate to X-register.
gi
010
008,43, 33, 010
Branches to program line 010.
:
1
009, 45 1
Recalls 20% tax rate to X-register.
b
010, 25
Divides tax rate by 100.
}
011, 36
Calculates tax.
fs
–190.22
Sets calculator to Run mode.
(Display shows results of running
of previous program.)
Now, we'll store the required numbers in registers R
0
, R
1
, and R
2
, then we’ll run the
program, using
Ç
so that we can check that the branching occurs properly. It’s
good practice with programs containing conditional test instructions to check that
the program branches correctly for all possible conditions: in this case, if the
income is less than, equal to, or greater than the test value.
Keystrokes
(RPN mode)
Display
20000
?
0
20,000.00
Stores test value in register R
0
.
20
?
1
20.00
Stores 20% tax rate in register R
1
.
25
?
2
25.00
Stores 25% tax rate in register R
2
.
15000
15,000.
Keys income less than test value
into display and X-register.
Ê
001, 45 0
Line 001:
:
0.
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