Using The Keyboard - HP -18C Owner's Manual

Line 3, the
calculator line,
is used for arithmetic calculations. At times,
the calculator line is also used as an edit line. Information you type is
displayed on the calculator line, where it can be edited. Then, de-
pending on the type of calculation you are doing, some other key
enters that information into the HP-18C.
The contents of lines 1 and 2 depend on the type of calculation you
are doing. Sometimes those lines display a history of the previous
contents of the calculator line. At other times, lines 1 and 2 display a
variety of information, such as results of calculations, lists of num-
bers, the time and date, and instruction messages.
When you turn the HP-18C on for the first time, numbers are dis-
played with two decimal places and with a period as the decimal
point. You can change the number of decimal places, and you can also
interchange the use of commas and periods in numbers (for example,
change 1,000.00 to 1.000,00). Refer to pages 43 and 44 for additional
information.
Using the Keyboard
Figure 1-2 illustrates the HP-18C keyboard and briefly describes the
use of many of the keys .
1: Starting to Use the HP-18C 17