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Section 1: Getting Started 23
File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 23 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Storage Registers
Numbers (data) in the hp 12c are stored in memories called “storage registers” or
simply “registers.” (The singular term “ memory” is sometimes used in this
handbook to refer to the entire collection of storage registers.) Four special
registers are used for storing numbers during calculations (these “stack registers”
are described in Appendix A), and another (called the “LAST X” register) is used
for storing the number last in the display before an operation is performed. In
addition to these registers into which numbers are stored automatically, up to 20
“data storage” registers are available for manual storage of numbers. These data
storage registers are designated R
0
through R
9
and R
.0
through R
.9
. Fewer registers
are available for data storage if a program has been stored in the calculator (since
the program is stored in some of those 20 registers), but a minimum of 7 registers
is always available. Still other storage registers — referred to as the “financial
registers” — are reserved for numbers used in financial calculations.
Storing and Recalling Numbers
To store the number from the display into a data storage register:
1. Press ? (store).
2. Key in the register number: 0 through 9 for registers R
0
through R
9
, or .0
through .9 for registers R
.0
through R
.9
.
Similarly, to recall a number from a storage register into the display, press
:
(recall), then key in the register number. This copies the number from the storage
register into the display; the number remains unaltered in the storage register.
Furthermore, when this is done, the number previously in the display is
automatically held inside the calculator for a subsequent calculation, just as the
number in the display is held when you key in another number.
Example:
Before you leave to call on a customer interested in your personal
computer, you store the cost of the computer ($3,250) and also the cost of a
printer ($2,500) in data storage registers. Later, the customer decides to buy six
computers and one printer. You recall the cost of the computer, multiply by the
quantity ordered, and then recall and add the cost of the printer to get the total
invoice.
Keystrokes Display
3250?1
3,250.00
Stores the cost of the computer in R
1
.
2500?2
2,500.00
Stores the cost of the printer in R
2
.
;
Turns the calculator off.