HP HP12C hp 12c_user's guide_English_E_HDPMBF12E44.pdf - Page 18

Keying in Large Numbers, The CLEAR Keys - 12c instructions

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18 Section 1: Getting Started Keying in Large Numbers Since the display cannot show more than 10 digits of a number, numbers greater than 9,999,999,999 cannot be entered into the display by keying in all the digits in the number. However, such numbers can be easily entered into the display if the number is expressed in a mathematical shorthand called "scientific notation." To convert a number into scientific notation, move the decimal point until there is only one digit (a nonzero digit) to its left. The resulting number is called the "mantissa" of the original number, and the number of decimal places you moved the decimal point is called the "exponent" of the original number. If you moved the decimal point to the left, the exponent is positive; if you moved the decimal point to the right (this would occur for numbers less than one), the exponent is negative. To key the number into the display, simply key in the mantissa, press Æ (enter exponent), then key in the exponent. If the exponent is negative, press Þ after pressing Æ. For example, to key in $1,781,400,000,000, we move the decimal point 12 places to the left, giving a mantissa of 1.7814 and an exponent of 12: Keystrokes Display 1.7814Æ12 1.7814 12 1,781,400,000,000 entered in scientific notation. Numbers entered in scientific notation can be used in calculations just like any other number. The CLEAR Keys Clearing a register or the display replaces the number in it with zero. Clearing program memory replaces the instructions there with gi00. There are several clearing operations on the hp 12c, as shown in the table below: Key(s) Clears: O Display and X-register. fCLEAR² Statistics registers (R1 through R6), stack registers, and display. fCLEARÎ Program memory (only when pressed in Program mode). fCLEARG Financial registers. fCLEARH Data storage registers, financial registers, stack and LAST X registers, and display. File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 18 of 209 Dimension: 14.8 cm x 21 cm

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18
Section 1: Getting Started
File name: hp 12c_user's guide_English_HDPMBF12E44
Page: 18 of 209
Printered Date: 2005/7/29
Dimension: 14.8 cm x 21 cm
Keying in Large Numbers
Since the display cannot show more than 10 digits of a number, numbers greater
than 9,999,999,999 cannot be entered into the display by keying in all the digits
in the number. However, such numbers can be easily entered into the display if the
number is expressed in a mathematical shorthand called “scientific notation.” To
convert a number into scientific notation, move the decimal point until there is only
one digit (a nonzero digit) to its left. The resulting number is called the “mantissa”
of the original number, and the number of decimal places you moved the decimal
point is called the “exponent” of the original number. If you moved the decimal
point to the left, the exponent is positive; if you moved the decimal point to the
right (this would occur for numbers less than one), the exponent is negative. To key
the number into the display, simply key in the mantissa, press
Æ
(
enter exponent
),
then key in the exponent. If the exponent is negative, press
Þ
after pressing
Æ
.
For example, to key in $1,781,400,000,000, we move the decimal point 12
places to the left, giving a mantissa of 1.7814 and an exponent of 12:
Keystrokes
Display
1.7814
Æ
12
1.7814
12
1,781,400,000,000 entered in
scientific notation.
Numbers entered in scientific notation can be used in calculations just like any
other number.
The CLEAR Keys
Clearing
a register or the display replaces the number in it with zero. Clearing
program memory replaces the instructions there with
gi
00. There are several
clearing operations on the hp 12c, as shown in the table below:
Key(s)
Clears:
O
Display and X-register.
f
CLEAR
²
Statistics registers (R
1
through R
6
), stack registers, and
display.
f
CLEAR
Î
Program memory (only when pressed in Program mode).
f
CLEAR
G
Financial registers.
f
CLEAR
H
Data storage registers, financial registers, stack and LAST X
registers, and display.