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108 108 108 108 Section 9: Section 9: Section 9: Section 9: Branching and Loopin Branching and Loopin Branching and Loopin Branching and Looping gg g
File name: HP 12c+_user's guide_English_E_HDP0F12AE03_062608 - Modified.doc Page: 108 of 213
Printed Date: 2021/6/16 Dimension: 14.8 cm x 21 cm
The program line immediately following that containing the conditional test
instruction can contain any instruction; however, the most commonly used
instruction there is
(
. If a
(
instruction follows a conditional test instruction,
program execution branches elsewhere in program memory if the condition is true
and continues with the next line in program memory if the condition is false.
Example: Example: Example: Example: The following program calculates income tax at a rate of 20% on
incomes of $20,000 or less and 25% on incomes of more than $20,000. To
conserve program lines, the program assumes that the test value — 20,000 — has
been stored in register R
0
and the tax rates — 20 and 25 — have been stored in
registers R
1
and R
2
, respectively.
Note:
Note: Note:
Note:
If a program requires that certain numbers be in the X- and Y-registers
when instructions such as
o
are executed, it is extremely helpful when
writing the program to show the quantities in each register after each
instruction is executed, as in the following diagram.