The Letter Keys And Variables - HP -225 Owner's Manual

Canceling Menus. Canceling a menu erases the current menu labels.
There are several ways to cancel menus:
B Menus are automatically canceled when you press a menu key to
execute a function.
B [¢] cancels the menu without executing a function. In multi-level
menus, (€] backs up one level at a time.
u cancels the menu, regardless of what levelit is at.
B Menus replace one another. For example, if you accidently press
B(VODES] instead of M[UNITS ] , you can press B[ UNITS without first
canceling the MODES menu.
| Number in Display I
E(uniTs]
| | l |
l\|/| T!\I/IP ||_ ch)L
L [ | |
-KG -LB -°C -°F -CM -IN -LTR -=GAL
The Letter Keys and Variables
Most of the keys have a letter A through Z associated with them. Each
letter is the name of a calculator variable. The 26 variables are loca-
tions in calculator memory used to store and retrieve numbers.
Pressing (store) or (recall) turns on the A..Z annunciator to
let you know that the keys are using their letter assignments. For ex-
ample, 12 turns on the A..Z annunciator. Then, pressing
displays A=12.00808, indicating that 12 has been stored into variable
A. This series of keystrokes is written as 12 A.
Storing and retrieving numbers using variables is covered in more de-
tail in chapter 2. Using variables with and is covered in
chapter 6.
20 1: Getting Started