How
ENTER
Works
You
know that Ienter Iseparates two numbers keyed in one after the
other. In terms of the stack, how does it do this? Suppose the stack is
againfilled with 1, 2, 3, and 4. Nowenter and add twonew
numbers:
i
5 +
6:
1
lost
2
lost
2 3
3
4
4
5
5 5
I
ENTER|
IS
3
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.
0
4
11
I
enter
Ireplicates the contents of the X-registerinto 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 se
quentially entered numbers.
Youcan use the replicating effect of I
enter
Ito clear the stack quickly:
press 01
enter
I("enterICenterI. All registers now contain zero. Note,
however, that you
don't
need
to clear the stack before doing
calculations.
Using a
Number
Twice
in a Row. You can use the replicating fea
ture of I
enter
Ito other advantages. To
add
a number to itself, press
ienter
inn.
Filling
the
Stack
With
a
Constant.
The replicating effect of I
enter
together with the replicating effect (from T into Z) of stack drop al
lows you to fill the stack with a numeric constant for calculations.
2:
The
Automatic
Memory
Stack
39
To Next Page
Loading...
