Section 1: Getting Started 23
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.
File name: hp 12c_user's guide_English_HDPMBF12E44
Printered Date: 2005/7/29
Page: 23 of 209
Dimension: 14.8 cm x 21 cm
