HP (Hewlett-Packard) Calculator HP 12C Financial Calculator User Manual

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Section 5: Additional Operating Features 91
File name: hp 12c pt_user's guide_English_HDPMF123E27 Page: 91 of 275
Printed Date: 2005/8/1 Dimension: 14.8 cm x 21 cm
The
~
key is also useful for checking the first number entered to make sure you
keyed it in correctly. Before pressing the operation key or equals key, however,
you should press
~
again to return the second number entered to the display.
Regardless of how many times you press
~
, the calculator considers the number
in the display to be the second number entered.
The Key in RPN Mode
Occasionally you may want to recall to the display the number that was there
before an operation was performed. (This is useful for doing arithmetic calculations
with constants and for recovering from errors in keying in numbers.) To do so,
press
gF
(LAST X). This section describes how to use
gF
in RPN mode.
Arithmetic Calculations With Constants
Example:
At Permex Pipes a certain pipe fitting is packaged in quantities of 15,
75, and 250. If the cost per fitting is $4.38, calculate the cost of each package.
Keystrokes
(RPN mode)
Display
15
\
15.00
Keys first quantity into calculator.
4.38
4.38
Keys unit cost into display.
§
65.70
Cost of a package of 15.
75
75.
Keys second quantity into display.
gF
4.38
Recalls unit cost — which was last
number in display before
§
was
pressed — into display.
§
328.50
Cost of a package of 75.
250
250.
Keys third quantity into display.
gF
4.38
Recalls unit cost into display again.
§
1,095.00
Cost of a package of 250.
Another method for doing arithmetic calculations with constants is described on
page 235.

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