HP 50g Graphing Calculator - Manual (Page 652)

Page 21-5
Local Variable Scope
Local variables are active only within a program or sub-program. Therefore,
their scope is limited to the program or sub-program where they’re defined. An
example of a local variable is the index in a FOR loop (described later in this
chapter), for example «
→ n x
«
1 n FOR j x NEXT n LIST
» »
The PRG menu
In this section we present the contents of the PRG (programming) menu with the
calculator’s system flag 117 set to SOFT menus. With this flag setting sub-
menus and commands in the PRG menu will be shown as soft menu labels. This
facilitates entering the programming commands in the line editor when you are
putting together a program.
To access the PRG menu use the keystroke combination „°. Within the
PRG menu we identify the following sub-menus (press L to move to the next
collection of sub-menus in the PRG menu):
Here is a brief description of the contents of these sub-menus, and their sub-
menus:
STACK: Functions for manipulating elements of the RPN stack
MEM:
Functions related to memory manipulation
DIR: Functions related to manipulating directories
ARITH: Functions to manipulate indices stored in variables
BRCH: Collection of sub-menus with program branching and loop functions
IF: IF-THEN-ELSE-END construct for branching
CASE: CASE-THEN-END construct for branching
All these rule may sound confusing for a new calculator user. They all can be
simplified to the following suggestion: Create directories and sub-directories
with meaningful names to organize your data, and make sure you have all the
global variables you need within the proper sub-directory.