HP 48g Graphing Calculator User Manual
Page 73
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Although they appear identical on the stack, there are two important
differences between formal variable names (that have no associated
objects) and quoted variable names (that have associated objects):
■ Evaluating a formal variable doesn't appear to do anything, because
the formal variable is returned again to the stack. Evaluating the
quoted name of a variable containing an object evaluates that
object.
m
Formal variables never appear in the VAR menu. All variables that
appear in the VAR menu have an associated object. However, you
ran
store a formal variable name in a, VAR variable with a
difftreni
name.
Sxaiiiple:
Enter the name
CD
© ©
ADD2
(ENTER)
onto the stack using single-quotes.
1
:
'RDD£'
Example:
Enter the formal variable name, C, onto the stack by
using the unquoted name. If an actual variable, C exists
somewhere in the current path, you wdll see its contents
instead of the variable name.
@ C (ENTER)
1
■ _____
BEEaDQ
Ixaiiiple:
Store the formal variable
'
C
'
in the variable
C2.
Tlien
evaluate C£ using the VAR menu.
Step 1:
Store ‘ C ' in
C2.
(^(CLEAR) iTPiMEMORY)
NEi.J (3 C (ENTER ) @ C2
(ENTER) 0 K (NXT) 0 K
Step 2:
Evaluate C2 using the VAR menu. Confirm that ' C ' is a
formal variable by pressing (
EVAL
).
(VAR)
1
:
¡BEHtgiTOiliilWIMlii
Memory 5-15