HP HP-25 - Page 87

Stopping Program Execution
works differently as an executed instruction in a program
than it does when pressed from the keyboard. As an executed
instruction,[R/s]stops program execution, allowing you to key
in new data or to write down an intermediate result.
When is then pressed from the keyboard in automatic RUN
mode, the calculator continues execution sequentially down-
ward.
Example Program. Universal Tins, a canning company,
needs to calculate the volumes of various cylindrically-shaped
cans. Universal would also like to be able to record the area of
the base of each can before the volume is calculated. One pro-
gram to solve this problem follows.
This program calculates the area of the base of each can and
then stops. When after you have written down that result, the
program can be restarted to calculate the final volume. The
formula used is:
Volume = base area X height = 77r? X h
The radius (r) and the height (/1) of the can are keyed into the
X- and Y-registers, respectively, before the program is run.
To record this program, set the PRGM-RUN switch to PRGM
erov
([T
~v
and
press
[
to
clear
program
memory
and
display
step
00.
Then
key
in
the
following
list
of
keys.
Press Display
B 01 15 02 Square the radius.
B 02 15 73 Placewin X.
03 61 Calculate the area of the base.
04 74 Stop to record the area.
05 61 Calculate the final volume.
In order to run this program set the PRGM-RUN switch to
RUN erou ll[MM v and press [1 [Prcv Jso that the calculator