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Section 2: Registers 33
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T
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4
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4
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4
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4
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Z
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3
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3
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3
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3
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Y
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1
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2
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1
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2
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X
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2
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1
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2
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1
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Notice that using R four times leaves the stack in 1ts original condition.
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Recalling π
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π is a fixed constant provided in your HP-65. Merely press g whenever you need it in a calculation.
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Sample Case: Calculate the area of a circle with a radius of 3.
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Area = π 32.
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Press
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See Displayed
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Comment
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g
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Recall π to X
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3 ENTER ×
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Calculate 3 × 3
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×
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Answer 9 × π
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Innovative Use of Calculator – A Compound Growth Schedule
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There is considerable room for innovation and creativity in using HP pocket calculators. Our customers have amazed
us by solving problems using highly original manipulations on the calculator. Here is such a routine to calculate a
geometric series, showing the compound growth of invested capital.
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A geometric series is a set of numbers in which each term is calculated by multiplying the previous term by some
factor. For example: 4, 8, 16, 32, etc. In this case, the factor is 2. In the practical World, the growth
of $1000 invested at 10% per period would constitute a geometric series in which the first term is 1000 and the
growth factor is 1.10. Our customer’s solution to generating the series was:
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