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Section 1: Getting Started 24
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When you press and hold a function key for
less than about a half second, the calculator displays the function
name and then executes the function when you release the key.
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When you press and hold a function key for
more than about a half second, the calculator first displays the function
name and then displays NULL.
The function is not executed when you release the key.
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For example, to calculate the number of square meters in a 160-meter square
field (160′ × 160′ or 1602):
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Now, to find the square root of that result:
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and X2
are examples of one-number function keys; that is, keys that execute upon a
single number. All standard HP-41C functions operate upon either one number
or two numbers at a time (except statistics functions like
Σ+ and Σ- —more
about these later).
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One-Number Operations
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To use any one number function:
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Key in the number.
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Execute the function.
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For example, to use the function 1/x, you first
key in the number represented by x, then press the function key
1/x. To calculate ¼, key in 4 (the x-number),
and press 1/x.
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