HP 15C Instrukcja Użytkownika Pobierz pdf (Strona 210)

210 Appendix B: Stack Lift and the LAST X Register

Disabling Operations

Stack Lift. There are four stack-disabling operations on the calculator.

These operations disable the stack lift, so that a number keyed in after one

of these disabling operations writes over the current number in the

displayed X-register and the stack does not lift. These special disabling

operations are:

v ` z w

Imaginary X-Register. A zero is placed in the imaginary X-register when

the next number following v, z, or w is keyed or recalled into

the display (real X-register). However, the next number keyed in or recalled

after − or ` does not change the contents of the imaginary X-

Enabling Operations

Stack Lift. Most of the operations on the keyboard, including one-and two-

number mathematical functions like x and *, are stack-enabling

operations. This means that a number keyed in after one of these operations

will lift the stack (because the stack has been  

real and imaginary stacks are affected. (Recall that a shaded X-register

means that its contents will be written over when the next number is keyed

in or recalled.)

4.0000

Keys:

(Assumes

stack

enabled.)

Stack

lifts.

Stack

disabled.

No stack

lift.

Refer to footnote, page 36.

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HP 15C Instrukcja Użytkownika Strona 210