HP 35s

2-12 RPN: The Automatic Memory Stack
Chain Calculations in RPN Mode
In RPN mode, the automatic lifting and dropping of the stack's contents let you
retain intermediate results without storing or reentering them, and without using
parentheses.
Work from the Parentheses Out
For example, evaluate (12 + 3) × 7.
If you were working out this problem on paper, you would first calculate the
intermediate result of (12 + 3) ...
(12 + 3) = 15
… then you would multiply the intermediate result by 7:
(15) × 7 = 105
Evaluate the expression in the same way on the HP 35s, starting inside the
parentheses.
You don't need to press  to save this intermediate result before
proceeding; since it is a calculated result, it is saved automatically.
Keys: Display: Description:


Light–years to Rigel Centaurus.

_
Speed of light, c.


Meters to R. Centaurus.
 

Retrieves c.


Meters to Sirius.
Keys: Display: Description:

 Calculates the intermediate result first.