HP 35s Instruction Manual page 6

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HP 35s Using Calculator Memories to Help Solve Problems
¹
Answer: The three exchanges swap values in two data registers without affecting an ongoing calculation. Note that
this works in algebraic and in RPN mode.
Pressing ¹ displays the A..Z symbol, and any letter from A through Z can be pressed. The value in the chosen
register is displayed in a message without changing the value on the lower line of the calculator screen. For example,
pressing ¹
Pressing the cancel key
message and brings back the display in the calculator screen.
Other Operations with Memory Registers
There is no special command to clear a register, it is enough to store a zero in it, but see also the description below of
CLVARS and of the register catalog.
Variables are used in equations and in programs. When the Solver is used, it asks which variable is the unknown one
and prompts for values for the other variables. The Integrate command must be told which is the variable to integrate for.
The INPUT command allows a program to request a value for a variable.
Variables can also be used with the program loop control commands ISG (Increment and Skip if Greater) and DSE
(Decrement and Skip if Equal).
The CLVARS command is activated by pressing º
Registers 28 through 33 are the statistics registers, normally used for statistical calculations. Numbers can not be stored
directly into them through statistical operations, but can be placed in them through the index register. This will lead to
errors if incorrect values are stored into these registers. The statistics registers are cleared when º
pressed.
Pressing selects the Memory menu and then pressing
cursor keys step through the registers. To see all the digits of a register, press
displayed. To copy a register to a calculation, press
the catalog, press the cancel key
Arithmetic calculations using the registers directly are described in a separate training aid, as has been mentioned
already.
As the above shows, the memory registers provide many ways to help in calculations on the HP 35s.
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¹ ¹
after Examples 1 and 3 should now display the density of concrete stored in register C.
on the lower left of the keyboard, or the back-arrow
, or to go back to the Memory menu, press
and clears all the variables A through Z to zero.
displays a catalog of the registers. The
. To clear the variable to zero, press
- 6 - HP 35s Using Calculator memories to Help Solve Problems - Version 1.0
Figure 8
at the middle right, clears the
when the register is
. To cancel
.
is
and