Chain Calculations in RPN Mode
Whenever the answer has just been calculated and is therefore in the display, you
can perform another operation with this number by simply keying in the second
number and then pressing the operation key: you need not press \ to separate
the second number from the first. This is because when a number is keyed in after
a function key (such as +,-,§, z, etc.) is pressed, the result of that prior
calculation is stored inside the calculator — just as when the \ key is pressed.
The only time you must press the \ key to separate two numbers is when you
are keying them both in, one immediately following the other.
The hp 12c platinum is designed so that each time you press a function key in RPN
mode, the calculator performs the operation then — not later — so that you see the
results of all intermediate calculations, as well as the "bottom line."
Example: Suppose you've written three checks without updating your checkbook,
and you've just deposited your paycheck for $1,053 into your checking account. If
your latest balance was $58.33 and the checks were written for $22.95, $13.70,
and $10.14, what is the new balance ?
Solution: When written down on paper, this problem would read
58.33 – 22.95 – 13.70 – 10.14 + 1053
Section 1: Getting Started
Keys the first number.
Pressing \ separates the second
number from the first.
Keys in the second number.
Pressing - subtracts the second
number from the first. The calculator
displays the result of this calculation,
which is the balance after subtracting
the first check.
Keys in the next number. Since a
calculation has just been performed,
do not press \; the next number
entered (13.7) is automatically
separated from the one previously in
the display (35.38).