HP 15C Instrukcja Użytkownika Pobierz pdf (Strona 35)

Section 3: The Memory Stack, LAST X, and Data Storage 35

The LAST X Register and K

The LAST X register, a separate memory register, preserves the value that

was last in the display before execution of a numeric operation.

Pressing

|K (LAST X) places a copy of the contents of the LAST X register

into the display (X-register). For example:

lost

Keys:

LAST X:

The K feature saves you from having to re-enter numbers you want to

use again (as shown under Arithmetic Calculations With Constants, page

39). It can also assist you in error recovery, such as executing the wrong

function or keying in the wrong number.

For example, suppose you mistakenly entered the wrong divisor in a chain

calculation:

Keystrokes

Display

287 v

287.0000

12.9 +

22.2481

Oops! The wrong divisor.

| K

12.9000

Retrieves from LAST X the last

entry to the X-register (the

incorrect divisor) before +

was executed.

Unless that operation was ’, S, or L       -

to R

). For a complete list of

operations which save x in LAST X, refer to appendix B.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 287 288

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HP 15C Instrukcja Użytkownika Strona 35