Section 1: Getting Started

23

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

Keystrokes (RPN mode)

58.33

\

58.33– 22.95 – 13.70 – 10.14 + 1053

Display

58.33Keys the first number.

58.33Pressing \separates the second number from the first.

22.95

22.95

Keys in the second number.

-

35.38

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.

13.7

13.7

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).

File name: hp 12c pt_user's guide_English_HDPMF123E27

Page: 23 of 275

Printed Date: 2005/8/1

Dimension: 14.8 cm x 21 cm