HP 0012C-90001 User Manual page 110

110 Section 9: 110 Section 9: Branching and Loopin Branching and Looping g g g
110 110 Section 9: Section 9: Branching and Loopin Branching and Loopin
Keystrokes Keystrokes
Keystrokes Keystrokes
g(07
:2
g(08
:1
b
fs
Now, we'll store the required numbers in registers R
the program, using Ê 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 Keystrokes
Keystrokes Keystrokes
20000?0
20?1
25?2
15000
Ê
Ê
Ê
Ê
Display Display
Display Display
04- 43, 33 07 If condition is true, branches to
program line 07.
05- 45 2 If condition is false, recalls 25% tax
rate to X-register.
06- 43, 33 08
Branches to program line 08.
07- 45 1
Recalls 20% tax rate to X-register.
08- 25
Calculates tax.
–12.36
Sets calculator to Run mode.
(Display shows results of running of
previous program.)
Display Display
Display Display
20,000.00 Stores test value in register R
20.00
Stores 20% tax rate in register R
25.00
Stores 25% tax rate in register R
15,000.
Keys income less than test value into
display and X-register.
Line 01: :0.
01- 45 0
20,000.00 Test value has been recalled to
X-register, moving income to
Y-register.
Line 02: ~
02- 34
15,000.00
Income has been placed in
X-register and test value has been
placed in Y-register.
Line 03: go
03- 43 34
15,000.00
Condition tested by o was true,
04- 43, 33 07
so program execution continued
with line 04: g(07.
, R , and R , then we'll run
0 1 2
0
.
.
1
.
2