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Section 9: Branching and Looping 131

File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 131 of 275

Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm

RPN program notes:

We’ll key the income into the display before running the

program so that it will be in the X-register when the

0 instruction in program

line 001 is executed. This instruction will place the test value 20,000 in the

X-register and (as explained in Appendix A) move the income into the Y-register.

The

instruction in program line 002 will exchange the numbers in the X- and

Y-registers (as also explained in Appendix A): 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 005 or the

1 instruction in

line 007 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

instruction in line 008 is executed.

Keystrokes

(RPN mode)

Display

007,43, 33, 002

Sets calculator to Program mode.

(Display shows program line at

which execution was halted at

end of preceding example.)

CLEAR

000,

Clears program memory.

001, 45 0

Recalls test value into X-register

and places income in Y-register.

002, 34

Places income in X-register and

test value in Y-register.

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