HP 12C Financial Programmable Calculator User's Guide download pdf (Page 171)

Appendix A: The Automatic Memory Stack 171

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Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm

Now let’s see what happens in the stack during a chain calculation:

)65()43(

See how the intermediate results are not only displayed when they are calculated,

but also automatically stored and available in the stack at just the right time!

That’s basically how the stack operates. In the rest of this appendix, we’ll take a

more detailed look at how numbers are entered into and rearranged within the

stack, and the effect of the various hp 12c functions on the numbers in the stack.

Getting Numbers Into the Stack: The Key

As discussed in earlier sections, if two numbers are being keyed in for a

two-number function — such as

— you press

between the numbers to

separate them. The following diagram illustrates what happens in the stack when

you enter the numbers 10 and 3 (to calculate, for example, 10 ÷ 3). (Assume that

the stack registers have been already loaded with the numbers shown as the result

of previous calculations).

When a digit is keyed into the display, it is simultaneously entered into the

X-register. As additional digit keys are pressed, the corresponding digits are

appended (that is, added to the right of) those already in the displayed X-register

until

is pressed. As shown in the preceding diagram, pressing

does the

following:

1. It copies the number from the displayed X-register into the Y-register. This

process is part of the stack lift.

2. It tells the calculator that the number in the displayed X-register is complete:

that is, it terminates digit entry.

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HP 12C Financial Programmable Calculator User's Guide Page 171