HP HP-11C User Manual

208 Section 11: Programming Techniques
Store this result in R.
If the value in Rp is positive or zero add the numbers in R4
and R, together and display the (real) result.
7. Ifthe valuein Rpisless than zero display the contents of R4
and R separately (the complex root).
8. Change the sign of the value in R, and repeat the previous
two steps.
In this refinement, we realize the importance of using registers to
store intermediate results. Also, the operations are better defined
and consideration is given to the actual output.
The degree of refinement of the final algorithm is up to personal
preference, but the more refined the algorithm the less likely the
program itself will have to be later modified in order to work
properly. Our final algorithm takes us to a satisfactory level.
Using the hypothetical registers R4, Rg, R, Rp and Rg do the
following:
1. Storeain Ry, negative bin Rgand cin Rg.
2. Divide Rg by twice R4 and store the result in Rp,.
3. Subtract four R4 times R, from Rp squared and store the
resultin Rg.
4. Find the square root of the absolute value of Rg and divide it
by twice R 4. Store this valuein Rp.
5. IfRpgis positive or zero add Rg to Rp and display the result.
6. IfRgisnegative display Rgand Ry separately.
7. Change the sign of Rg and repeat the previous two steps.
This algorithm takes into account the initial storage of data and
reuses Rp, thereby reducing the total number of storage registers
needed.
Flowcharts
A useful way of visualizing your developing algorithm is to use a
“flowchart”. A flowchart is a diagram of the flow of the algorithm,
giving form to the train of thought you are developing. An example
that uses our developed algorithm is:

HP HP-11C Specifications

General

Brand	HP
Model	HP-11C
Category	Calculator
Language	English