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90 Section 5: Additional Operating Features
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 90 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
Special Displays
Running.
Certain functions and many programs may take several seconds or
more to produce an answer. During these calculations, the word
running
flashes
in the display to let you know that the calculator is running.
Overflow and Underflow.
If a calculation results in a number whose
magnitude is greater than 9.999999999 ×10
99
, the calculation is halted and the
calculator displays
9.999999 99
(if the number is positive) or
–9.999999 99
(if the number is negative).
If a calculation results in a number whose magnitude is less than 10
–99
, the
calculation is not halted, but the value 0 is used for that number in subsequent
calculations.
Errors.
If you attempt an improper operation — such as division by zero — the
calculator will display the word
Error
followed by a digit (
0
through
9
). To clear
the
Error
display, press any key. This does not execute that key’s function, but
does restore the calculator to its condition before the improper operation was
attempted. Refer to Appendix D for a list of error conditions.
Pr Error.
If power to the calculator is interrupted, the calculator will display
Pr
Error
when next turned on. This indicates that Continuous Memory — which
contains all data, program, and status information — has been reset.
The Key in RPN Mode
Suppose you need to subtract $25.83 from $144.25, and you (mistakenly) key in
25.83 as the first number and then key in 144.25 as the second number. But then
you realize that when written down on paper, the desired calculation reads
144.25 – 25.83, so that you have unfortunately keyed in the second number first.
To correct this mistake, merely exchange the first and second numbers by pressing
~
, the exchange key.
Keystrokes
(RPN mode)
Display
25.83
\
144.25
144.25
Oops! You mistakenly keyed in the
second number first.
~
25.83
Exchanges the first and second
numbers. The first number keyed in
is now in the display.
-
118.42
The answer is obtained by pressing
the operation key.