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Two-Number Functions. When a function requires two numbers,
the numbers are entered like this: numberl
number2. Pressing
evaluates the current expression and displays :. For example,
the following keystrokes calculate the percent change between 17 and
29:
Keys:
Display:
Description:
17
17.0000
Enters numberl, dis-
plays : annunciator.
29
29
Enters number?2.
(«)
70.5882
Calculates the percent
change.
Calculate the number of combinations of four items taken two at a
time:
4
2 (]
6.0000
Calculates number of
combinations.
If you enter numberl, then press a two-number function key without
pressing (INPUT], the calculator supplies a zero as number2. If you enter a
number, press (INPUT], and then press a two-number function key, the cal-
culator uses the same number for both numberl and number2.
Display Format of Numbers
When you turn on the HP-20S for the first time, numbers are displayed
with four decimal places and a period as the decimal point. The display
format controls how many digits appear in the display.
16
1: Getting Started
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