
Section 3: Automatic Memory Stack and ALPHA Register48


Here is what happens when you executed the
function:


First, after you keyed in the numbers, the stack looked like this (the T and
Zregisters are shown cleared to zero for clarity):



T

0.0000


Z

0.0000


Y

27.9300


X

167.54 _



Then when you pressed , the result, the
square root of the number in the Xregister, was placed in the Xregister
(displayed).



T

0.0000


Z

0.0000


Y

27.9300


X

112.9437



The onenumber function executes upon only the number in the displayed Xregister,
and the answer writes over the number that was in the Xregister. No other
stack register is affected by a onenumber function.


TwoNumber Functions and the Stack


The HP41C performs arithmetic operations by positioning the numbers in the
stack the same way you would on paper. For instance, if you wanted to add 17 and
46 you would write 17 on the paper and then write 46 underneath is, like this:




and then you would add, like this:




Numbers are positioned the same way in the calculator. Here’s how it
is done.


0.0000

17 _

17.0000

46 _

63.0000

