HP 9100B Operating & Programming Manual page 47

THE KEYBOARD
ARITHMETIC KEYS
notice that, after the initial quantities have been entered and
multiplied at step 4, the step sequence is repetitive, steps 5
through 10, 11 through 16, and so on.
This 'program' can be adapted to solve other expressions by
changing the arithmetic instructions; for example, if the X and
+
keys are interchanged then the product of the sums 1s solved
(n
1
+
n
2)
(n
3
+
n -t) (n ; : ;
+
n
6 ) - - -
etc.
lf the X keys are changed to
+,
then the sum of the quotients
1s solved:
n
1
+
n ., n
t
+
n
5
More complex expressions, such as -
+
n
+
n
3
6
etc. can also be solved using this general program form, how-
ever, in these cases additional steps are required.
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