Order of entry and the v key, Order of entry and the – HP 15c User Manual

Page 37

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Section 3: The Memory Stack, LAST X, and Data Storage

37

lost

T

z

z

z

z

Z

z

z

z

z

Y

y

y

y

y

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

98

-15

+15

x15

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:

lost

lost

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.

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