HP 48g Graphing Calculator - Manual (Page 26)

Example: Enter the number —123.4 in the command line.
Step 1: Key in the digits.
123 04 123.4 i
Step 2: Make the number negative.
-123.44
Press ( c a n c e l ) (the ( O N ) key) to delete the command line.
To key ill a number as a mantissa and an exponent;
1. Key in the mantissa. If it’s negative, press (+/-) to change its sign.
2. Press ( e e x
). (It types an E for “exponent.”)
3. Key in the exponent—the power of 10. If it’s negative, press [+/-).
Keying In Characters (the Alpha Keyboard)
The HP 48 features an “alpha” keyboard that lets you type letters and
other characters into your data. Activate the alpha keyboard using the
(3 key. (The Ct annunciator turns on while the alpha keyboard is
active.)
When you press the key, you can type in capital letters. The
letters available are printed in white to the lower right of each key.
In addition, the left-shift and right-shift keys provide additional
characters:
B The left-shifted alpha keyboard types in lowercase letters.
■ The right-shifted alpha keyboard types in Greek letters and
miscellaneous symbols.
To keep the HP 48 keyboard from appearing too cluttered, most of the
alpha left- and right-shift keys are not shown on it. For your reference,
the next illustration shows how keys are interpreted when the Ot
annunciator is on.
2-2 Entering and Editing Objects