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Section 1: General Operations 24
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of ten. For example, key in Planck’s constant (h)— roughly, 6.625 × 10–27
erg. sec.—and multiply it by 50. Since the problem deals with very small numbers, the keystrokes to reset
the display to scientific notation to show six decimal places are included in the following example.
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Press
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See Displayed
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6.625 EEX
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27
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CHS
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DSP 6
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ENTER
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50 ×
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If you return to DSP 2 the result is rounded to zero.
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Last X
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Last X is the name of the register reserved for storing the latest value of X (the number you see in the
display) just after an opera tion using it has been specified and prior to its use in a calculation. Initially
set to zero when the power comes on, Last X remains unchanged until a calculation of x or
x and y is attempted;
at such a time, x is first saved in Last X as an automatic prelude to the
calculation. The saved value
is recallable to X (repeatedly if desired) by the gLSTX operation. Last X is useful in
recovering from accidental wrong keystrokes such as pressing the wrong arithmetic key or entering a wrong number.
For example, if you were performing a long calculation where you meant to subtract 3 from 12 and divided
instead, you could compensate as follows:
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Press
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See Displayed
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Comment
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12 ENTER 3 ÷
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Oops–you wanted to subtract.
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gLSTX
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Retrieves last number preceding division operation.
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