Section 3: The Memory Stack, LAST X, and Data Storage 41
Loading the Stack with a Constant. Because the number in the T-register
is replicated when the stack drops, this number can be used as a constant
in arithmetic operations.
T
c
c
New constant
generation.
Z
c
c
Y
c
c
Drops to interact
with X-register.
X
x
cx
Keys: *
Fill the stack with a constant by keying it into the display and pressing
v three times. Key in your initial argument and perform the
arithmetic operation. The stack will drop, a copy of the constant will “fall”
into the Y-register, and a new copy of the constant will be generated in
the T-register.
If the variables change (as in the preceding example), be sure to clear the
display before entering the new variable. This disables the stack so that
the arithmetic result will be written over and only the constant will occupy
the rest of the stack.
If you do not have different arguments, that is, the operation will be
performed upon a cumulative number, then do not clear the display—
simply repeat the arithmetic operation.
Example: A bacteriologist tests a certain
strain of microorganisms whose
population typically increases by 15%
each day (a growth factor of 1.15). If she
starts with a sample culture of 1000, what
will be the bacteria population at the end
of each day for four consecutive days?
Keystrokes Display
1.15
1.15
Growth factor.
v v v
1.1500
Filling the stack.
1000
1,000
Initial culture size.
To Next Page
Loading...
Need help?
General
