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One-Number Functions
and the Stack
One-number functions execute upon the number in the X-
register only, and the contents of the Y-, Z-, and T-registers
are unaffected when a one-number function key is pressed.
For example, with numbers positioned in the stack as in the
earlier example, pressing the [7/[=]keys changes the stack
contents . . .
. fromthis ..
.. . to this.
T
T o000 |
Z
0.00 A
z Dfi)o |
Y s1a gz*
Y 31432
X
1689.4 * Display
X L72€267 |
Display
The one-number function executes upon only the number in the
displayed X-register, and the answer writes over the number
that was in the X-register. No other registeris affected by a one-
number function.
Two-Number Functions
and the Stack
Hewlett-Packard calculators do arithmetic by positioning the
numbers in the stack the same way you would on paper. For
instance, if you' wanted to add 34 and 21 you would write 34 on a
piece of paper and then write 21 underneath it, like this:
34
21
and then you would add, like this:
34
+21
55
Numbers are positioned the same way in the HP-25. Here's
how it is done. (If you clear the previous number entries
first by pressing [7 [E7] the numbers in the stack will cor-
respond to those shown in the example below.)
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