The automatic stack lift and stack drop make it possible to do calculations without using parenthesis or storing intermediate results. A nested calculation is solved simply as a series of one- and two-number operations.
Almost every nested calculation you are likely to encounter can be done using just the four stack registers. It is usually wisest to begin the calculation at the innermost number or pair of parentheses and work outward(as you would for a manual calculation). Otherwise, you may need to place an intermediate result into a storage register. For example, consider the calculation of
3[4+5(6+7)]:
Keystrokes Display
6 ENTER 7 + 13.0000
Intermediate result of (6+7).
5 * 65.0000
Intermediate result of 5(6+7).
4 + 69.0000
Intermediate result of[4+5(6+7)].
3 * 207.0000
Final result: 3[4+5(6+7)].
The following sequence illustrates the stack manipulation in this example. The stack automatically drops after each two-number calculation, and then lifts when a new number is keyed in. (For simplicity, throughout the rest of the examples no arrows between stacks will be shown.)
T t z y y y
Z z y x x y
Y y x 6 6 x
X x 6 6 7 13
Keys: 6 ENTER 7 +
T y y y y
Z y x y x
Y x 13 x 65
X 13 5 65 4
Keys: 5 * 4
T y y y y
Z x y x y
Y 65 x 69 x
X 4 69 3 207
Keys: + 3 *
See "ARITHMATIC CALCULATIONS WITH CONSTANTS" this help
