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18
18
Section 1: Getting Started
Section 1:
Getting Started
18
18
Section 1:
Section 1:
Getting Started
Getting Started
Keying in Large Numbers
Keying in Large Numbers
Keying in Large Numbers
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 (
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
Keystrokes
Keystrokes
Keystrokes
1.7814Æ12
Numbers entered in scientific notation can be used in calculations just like any
other number.
The CLEA
The CLEAR Keys
The CLEA
The CLEA
R Keys
R Keys
R Keys
Clearing
a register or the display replaces the number in it with zero. Clearing
program memory replaces the instructions there with g(00. There are several
clearing operations on the hp 12c, as shown in the table below:
Key(s)
Key(s)
Key(s)
Key(s)
O
Display and X-register.
fCLEAR²
Statistics registers (R
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.
Display
Display
Display
Display
1.7814 12
1,781,400,000,000 entered in
scientific notation.
Clears:
Clears:
Clears:
Clears:
through R
1
enter exponent
), stack registers, and
6
),
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