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How Enter Works - HP 35s User Manual

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How ENTER Works

You know that
of the stack, how does it do this? Suppose the stack is again filled with 1, 2, 3, and
4. Now enter and add two new numbers:
T
1
Z
2
Y
3
X
4
1. Lifts the stack.
2. Lifts the stack and replicates the X–register.
3. Does not lift the stack.
4. Drops the stack and replicates the T–register.

replicates the contents of the X–register into the Y–register. The next
number you key in (or recall) writes over the copy of the first number left in the X–
register. The effect is simply to separate two sequentially entered numbers.
You can use the replicating effect of

you don't need to clear the stack before doing calculations.
Using a Number Twice in a Row
You can use the replicating feature of
number to itself, press
2-6
RPN: The Automatic Memory Stack
separates two numbers keyed in one after the other. In terms
1 lost
2
3
4
5
1
. All stack registers now contain zero. Note, however, that

.
5+6
2 lsot
3
4
5
5
2
3
to clear the stack quickly: press 0
to other advantages. To add a
3
3
4
3
5
4
6
11
4

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