Clearing Storage Registers
To clear a single storage register – that is, to replace the number in it with zero –
merely store zero into it. You need not clear a storage register before storing data
into it; the storing operation automatically clears the register before the data is
To clear all storage registers at once – including the financial registers, the stack
registers, and the LAST X register – press fCLEARH.
All storage registers are also cleared when Continuous Memory is reset (as
described on page 70).
Storage Register Arithmetic
Suppose you wanted to perform an arithmetic operation with the number in the
display and the number in a storage register, then store the result back into the
same register without altering the number in the display. The HP 12C Platinum
enables you to do all this in a single operation.
1. Press ?.
2. Press +,-,§, or z to specify the desired operation.
3. Key in the register number.
When storage register arithmetic is performed, the new number in the register is
determined according to the following rule:
Storage register arithmetic is possible with only registers R
Example: In the example on page 21, we updated the balance in your
checkbook. Let's suppose that because data is stored indefinitely in your
calculator's Continuous Memory, you keep track of your checking account
balance in the calculator. You could use storage register arithmetic to quickly
update the balance after depositing or writing checks.
CLEARH is not programmable.
Section 1: Getting Started
This also clears the
umber i display