Evaluating Local Names - HP 48gII Advanced User's Reference Manual

then
 a creates local variable a = 20.
 ab creates local variables a = 6 and b = 20.
 abc crates local variables a = 10, b = 6, and c = 20.
The defining procedure then uses the local variables to do calculations.
Local variable structures have these advantages:
The " command stores the values from the stack in the corresponding variables — you don't need to
!
explicitly execute STO.
Local variables automatically disappear when the defining procedure for which they are created has
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completed execution. Consequently, local variables don't appear in the VAR menu, and they occupy user
memory only during program execution.
Local variables exist only within their defining procedure — different local variable structures can use the
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same variable names without conflict.
Example: The following program SPHLV calculates the volume of a spherical cap using local variables. The
defining procedure is an algebraic expression.
Program:
«
 r h
'1/3*œ*h^2*(3*r-h)' Expresses the defining procedure. In this program,
NUM
»
OSPHLVK
Now use SPHLV to calculate the volume of a spherical cap of radius r =10 and height h = 3. Enter the data on
the stack in the correct order, then execute the program.
10 `3
J%SPHLV%

Evaluating Local Names

Local names are evaluated differently from global names. When a global name is evaluated, the object stored in
the corresponding variable is itself evaluated. (You've seen how programs stored in global variables are
automatically evaluated when the name is evaluated.)
1-8 RPL Programming
Level 2 Level 1
r h
Comments:
Creates local variables r and h for the radius of the
sphere and height of the cap.
the defining procedure for the local variable
structure is an algebraic expression.
Converts expression to a number.
Stores the program in variable SPHLV.
"
Level 1
"
volume