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36
Section 3: The Memory Stack, LAST X, and Data Storage
Keystrokes
*
13.9 +
Calculator Functions and the Stack
When you want to key in two numbers, one after the other, you press
v between entries of the numbers. However, when you want to key
in a number immediately following any function (including manipulations
like )), you do not need to use v. Why? Executing most HP-15C
functions has this additional effect:
• The automatic memory stack is lift-enabled that is, the stack will lift
automatically when the next number is keyed or recalled into the
display.
• Digit entry is terminated, so the next number starts a new entry.
Keys:
There are four functions – v, `, z, and w – that disable stack
*
lift.
They do not provide for the lifting of the stack when the next number is
keyed in or recalled. Following the execution of one of these functions, a new
number will simple write over the currently displayed number instead of causing
the stack to lift. (Although the stack lifts when v is pressed, it will not lift
when the next number is keyed in or recalled. The operation of v
illustrated on page 34 shows how v thus disables the stack.) In most
cases, the above effects will come so naturally that you won't even think
about them.
*
− will also disable the stack lift if digit entry is terminated, making − clear the entire display like
`. Otherwise, it is neutral. For a further discussion of the stack, refer to appendix B.
Display
287.0000
20.6475
T
t
Z
z
Y
y
X
4
¤
Reverses the function that
produced the wrong answer.
The correct answer.
lost
t
z
z
y
2
y
2
5
5
z
z
y
7
+
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