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HP HP-12c Manual

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Section 1: Getting Started 23
proper time, just as you would yourself.
2
But with the HP 12C Platinum, you
don’t need to write down the results of an intermediate calculation, and you don’t
even need to manually store it and recall it later.
By the way, notice that in step 2 you needed to press \ again. This is simply
because you were again keying in two numbers immediately following each
other, without performing a calculation in between.
To check your understanding of how to calculate with your HP 12C Platinum, try
the following problems yourself. Although these problems are relatively simple,
more complicated problems can be solved using the same basic steps. If you
have difficulty obtaining the answers shown, review the last few pages.
Storage Registers
Numbers (data) in the HP 12C Platinum are stored in memories called “storage
registers” or simply “registers.” (The singular term “memory” is sometimes used
in this handbook to refer to the entire collection of storage registers.) Four
special registers are used for storing numbers during calculations (these “stack
registers” are described in Appendix A), and another (called the “LAST X”
register) is used for storing the number last in the display before an operation is
performed. In addition to these registers into which numbers are stored
automatically, up to 20 “data storage” registers are available for manual storage
of numbers. These data storage registers are designated R
0
through R
9
and R
.0
through R
.9
. Fewer registers are available for data storage if a program has been
stored in the calculator (since the program is stored in some of those 20
registers), but a minimum of 7 registers is always available. Still other storage
registers – referred to as the “financial registers” – are reserved for numbers used
in financial calculations.
2.
Although you don’t need to know just how these numbers are stored and brought back at just
the right time, if you’re interested you can read all about it in Appendix A. By gaining a more
complete understanding of the calculator’s operation, you’ll use it more efficiently and
confidently, yielding a better return on the investment in your HP 12C Platinum.
34+()56+()× 77.00=
27 14–()
14 38+()
-----------------------0.25=
5
31621++
--------------------------- 0 . 1 3=
… 23 …


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