HP -32S Owner's Manual page 232

Both routines are based on the "Ferris wheel principle." The program
has a circular structure. When the program is started, it loops through
a cycle (or series) of input prompts. You repeatedly ignore the
prompts (by pressing IR/s I) until the prompt that corresponds to the
units of your input comes up. For instance, if you wanted to input
kelvins, you would start the temperature program by pressing IXEQ IT
and then by pressing IR/s I until the K? prompt appeared. At the
prompt you would key in the temperature in kelvins and press IR/SI
until you come to the prompt indicating the units that you desired
(F? for Fahrenheit, for example). The value displayed with the
prompt would be the temperature in degrees Fahrenheit. To end the
program, press l"c"l.
input /output
£=JT-273.15
input /output -<-
n
*=P
CI
0
Rl
/"= jjff*32
Fl < » input /output
*=/"♦ 459.67
input/output
Ferris Wheel Structure for Temperature Conversion
The program has been designed to minimize the use of the stack.
When the program is terminated, the values you had in the X- and Y-
registers are left in the Y- and Z-registers, respectively, and the
converted value is displayed. If the value that you wish to convert is
in the X-register (the display) when you start the program, press IR* I
to retrieve it when you get to the correct prompt.
The length- and area-conversion routines give good examples of flag
usage. Note that flag 2 was selected so that the 2 annunciator in the
display would indicate that the unit is squared.
230 14: Miscellaneous Programs