HP HP-65 - Page 66

Switch to W/PRGM.
Clear memory by pressing [l .
Key in following sequence.
Keys Comment
o
@ (s Compute arc sine.
(0] 0 to X lifts arc sine to Y.
B Put0inY and arc sine in X.
Test and skip these steps
p P
(6] if angle is negative.
(0] Add 0 or 360.*
+
RTN Stop.
Running the Function
Switch to RUN
Press See Displayed
s0 T (ceorees)
5 CHs 330.00
Looping N Times
The operation is useful in repeating a labelled segment of a
program a given number of times. The repeated segment is called
a loop. Rule: To execute a labeled program segment n times,
preset n in Ry and end the segment with a to determine
whether or not to repeat the segment.
*If the angle is negative, @ @ @ are put into the X register as 360.
If the angle is positive, E] @ are skipped and @ puts zero into X.
Thus, either 0 or 360 are added to the angle.
Step saving techniques like this will undoubtedly occur to you in writing your
own programs.