Section 3: The Memory Stack, LAST X, and Data Storage 37
T
z
z
z
z
Z
z
z z
z
Y
y
y y z
X 7
0
6
y
6
Keys:
|
`
6
y
Order of Entry and the v Key
An important aspect of two-number functions is the positioning of the
numbers in the stack. To execute an arithmetic function, the numbers
should be positioned in the stack in the same way that you would
vertically position them on paper. For example:
98
98
98
15
15
15
As you can see, the first (or top) number would be in the Y-register, while
the second (or bottom) number would be in the X-register. When the
mathematics operation is performed, the stack drops, leaving the result
in the X-register. Here is how a subtraction operation is executed in the
calculator:
T
t
z
y
y
y
Z
z
y
x
x
y
Y
y x
98
98
x
X
x
98
98
15
83
Keys:
98
v
15
-
The same number positioning would be used to add 15 to 98, multiply 98
by 15, or divide 98 by 15.
98
15
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