HP HP12C hp 12c_user's guide_English_E_HDPMBF12E44.pdf - Page 107

Conditional Branching

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Section 9: Branching and Looping 107 Keystrokes Ê t t(or any key) Display 07- 43, 33 -12.23 -530.99 -12.36 -12.36 02 Line 07: gi02. This is the end of the second pass through the loop. Portion of third month's payment applied to interest. Portion of third month's payment applied to principal. Halts program execution. Conditional Branching Often there are situations when it is desirable for a program to be able to branch to different lines in program memory, depending on certain conditions. For example, a program used by an accountant to calculate taxes might need to branch to different program lines depending on the tax rate for the particular income level. The hp 12c provides two conditional test instructions that are used in programs for conditional branching: z o tests whether the number in the X-register (represented by the x in the key symbol) is less than or equal to the number in the Y-register (represented by the y in the key symbol). As discussed in Appendix A, the number in the X-register is simply the number that would, if the calculator were in Run mode, be currently in the display; and the number in the Y-register is the number that would, if the calculator were in Run mode, have been in the display when \ was pressed. For example, pressing 4\5 would place the number 4 in the Y-register and the number 5 in the X-register. z m tests whether the number in the X-register is equal to zero. The possible results of executing either of these instructions are: z If the condition tested for is true when the instruction is executed, program execution continues sequentially with the instruction in the next line of program memory. z If the condition tested for is false when the instruction is executed, program execution skips the instruction in the next line of program memory and continues with the instruction in the following line. These rules can be summarized as "DO if TRUE". File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 107 of 209 Dimension: 14.8 cm x 21 cm

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Section 9: Branching and Looping
107
File name: hp 12c_user's guide_English_HDPMBF12E44
Page: 107 of 209
Printered Date: 2005/7/29
Dimension: 14.8 cm x 21 cm
Keystrokes
Display
Ê
07- 43, 33
02
Line 07:
gi
02.
This is the end of the second pass
through the loop.
–12.23
t
–530.99
Portion of third month’s payment
applied to interest.
–12.36
Portion of third month’s payment
applied to principal.
t
(or any key)
–12.36
Halts program execution.
Conditional Branching
Often there are situations when it is desirable for a program to be able to branch
to different lines in program memory, depending on certain conditions. For
example, a program used by an accountant to calculate taxes might need to
branch to different program lines depending on the tax rate for the particular
income level.
The hp 12c provides two
conditional
test instructions that are used in programs for
conditional branching:
o
tests whether the number in the X-register (represented by the
x
in the
key symbol) is less than or equal to the number in the Y-register (represented
by the
y
in the key symbol). As discussed in Appendix A, the number in the
X-register is simply the number that would, if the calculator were in Run mode,
be currently in the display; and the number in the Y-register is the number
that would, if the calculator were in Run mode, have been in the display
when
\
was pressed. For example, pressing 4
\
5 would place the
number 4 in the Y-register and the number 5 in the X-register.
m
tests whether the number in the X-register is equal to zero.
The possible results of executing either of these instructions are:
If the condition tested for is true when the instruction is executed, program
execution continues sequentially with the instruction in the next line of
program memory.
If the condition tested for is false when the instruction is executed, program
execution skips the instruction in the next line of program memory and
continues with the instruction in the following line.
These rules can be summarized as “DO if TRUE”.