|
|
Appendix B
|
|
Combined Arithmetic Processes
|
|
|
The HP-80 performs combined arithmetic operations—serial, mixed and chain calculations—with ease. If you read Appendix A (Design Concepts) you now know how the operational stack works and can apply that knowledge to the following examples.
|
|
Automatic Doubling, Squaring
|
If you want to double or square a number, it’s not necessary to press
that number twice. Merely enter the number, save it and press  + to double or × to square the number. For example, to double 3,
|
|
| | Enter: | | | See Displayed: | | |
|
| |
| |
|
3 doubled
|
|
|
|
The following illustrates the data flow in the stack.
|
|
| |
| Press | See | Remarks |
|
3
|
3.
|
3 is keyed into X.
|
|
SAVE
|
3.00
|
3 is loaded into X and Y.
|
|
+
|
6.00
|
Contents of X and Y are added; result (6) is loaded into X.
|
| |
|
|
|
To square 3,
|
|
| | Enter: | | | See Displayed: | | |
|
| |
| |
|
3 squared
|
|
|
|
Again in the stack,
|
|
| |
| Press | See | Remarks |
|
3
|
3.
|
3 is keyed into X.
|
|
SAVE
|
3.00
|
3 is loaded into X and Y.
|
|
×
|
9.00
|
Contents of X and Y are multiplied and the product (9) is loaded into X.
|
| |
|
|
