HP HP-11C - Chaincalculations

Section 2: Memory Stack, LAST X, and Data Storage 31
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Chain Calculations
Whether you use your HP-11C mostly for direct keyboard solutions
or programmed solutions, you are likely to use chain calculations
frequently. It is in this area that the simplicity and power of your
HP-11C’s logic system becomes very apparent. Even during
extremely long calculations, you still perform only one operation at
a time. The automatic memory stack stores up to four intermediate
results until you need them, then inserts them into the calculation.
Thus, working through a problem is as natural as if you were
working it out with pencil and paper.
You have already learned how to key in a pair of numbers using the
key and then perform a calculation. You have seen how the
stack drops as a result of executing some functions and how the
stack lifts automatically when you key in a number after executing
a function. To see how these features operate in a chain
calculation, let’s solve 3+ 6 — 4 + 2 = ? (Assume the stack cleared to
zeros by pressing (] )
’ lost
-—>o/o — io
—»| o0 /o . \o
—»| O /3 — 0
~L3 43 ™ 9
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