Recall Arithmetic - HP 33s User Manual

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15
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3

Recall Arithmetic

Recall arithmetic uses
arithmetic in the X–register using a recalled number and to leave the result in the
display. Only the X–register is affected.
New x = Previous x {+, –, , } Variable
For example, suppose you want to divide the number in the X–register (3,
displayed) by the value in A(12). Press
still in A. Recall arithmetic saves memory in programs: using
instruction) uses half as much memory as
A 12
t
T
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y
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3
X
Example:
Suppose the variables D, E, and F contain the values 1, 2, and 3. Use storage
arithmetic to add 1 to each of those variables.
A
T
Z
Y
X
h Ù h Ã
,
h ¯
h
A
T
Z
Y
X
Result: 15
12
that is,A
t
z
y
3
h ¸
, , or
A. Now x = 0.25, while 12 is
Ù
A, (two instructions).
12
t
z
Result: 3
y
that is, x 12
0.25
Storing Data into Variables
3
x
h ¯
to do
h Ù
A (one
12
3–5