HP 48GII User Manual

1-8 RPL Programming
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
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
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.
Level 2 Level 1 " Level 1
r h
"
volume
Program: Comments:
«
 r h
Creates local variables r and h for the radius of the
sphere and height of the cap.
'1/3*œ*h^2*(3*r-h)'
Expresses the defining procedure. In this program,
the defining procedure for the local variable
structure is an algebraic expression.
NUM
Converts expression to a number.
»
OSPHLVK
Stores the program in variable SPHLV.
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.)

HP 48GII Specifications

General

Battery type	CR2032
Type	Scientific
Form factor	Pocket

Weight and Dimensions

Weight	220 g
Dimensions (WxDxH)	184 x 87 x 23.5 mm

Summary

RPL Programming

Understanding Programs

Programs as objects, delimiters, and basic structure.

Entering and Executing Programs

Details on how to create, store, and run programs.

Using Conditional Structures

Covers IF, CASE, IFT, IFTE structures for program decision-making.

Input and Output Commands

Details commands like PROMPT, INPUT, INFORM, CHOOSE for user interaction.

RPL Programming Examples

Fibonacci Numbers

Demonstrates recursive and loop-based Fibonacci calculations.

Minimum and Maximum Array Elements

Details finding min/max elements using MNX and MNX2.

Applying a Program to an Array

Explains the APLY command for transforming array elements.

Full Command and Function Reference

How to Access Commands and Functions

Explains key presses and menu paths to access commands.

ABS (Absolute Value)

Details the absolute value function and its array behavior.

ACOS (Arc Cosine)

Explains the inverse cosine function, domain, and range.

Computer Algebra Commands

CAS Operations

Overview of CAS operations and their categorization by menu.

Algebra commands

Lists and describes commands for algebraic manipulation.

Calculus Commands

Covers derivation, integration, and limit commands.

Equation Reference

Columns and Beams (1)

Provides equations for structural mechanics.

Electricity (2)

Lists equations related to electrical circuits and laws.

Fluids (3)

Covers equations for fluid mechanics.

The Development Library

Introduction

Explains the purpose and usage of the development library.

Tools for Development

Details APEEK, PEEK, POKE, POKEARM commands.

MASD Compiler

Discusses syntax, modes, and directives for MASD.

Error and Status Messages

Messages Listed Alphabetically

Alphabetical list of error messages.

Messages Listed Numerically

Numerical list of error messages by hex code.

System Flags

System Flags (continued)

Description of various system flags.

System Flags (continued)

Continuation of system flags description.

Reserved Variables

Contents of the Reserved Variables

Explanation of key reserved variables.

PPAR

Details plotting parameters.

Technical Reference

Object Sizes

Lists object sizes in bytes.

Symbolic Integration Patterns

Provides a table of symbolic integration patterns.

Parallel Processing With Lists

General rules for parallel processing

Explains conditions for parallel list processing.

Group 4: ADD and +

Describes how ADD and + handle parallel list operations.

Keyboard Shortcuts

Press and Hold key combinations

Lists functions performed by key combinations.

Shifted softkeys

Explains shift key effects on menu labels.

The Menu-Number Table

-- menus 0-117 are semi-compatible with 48G menus --

Menu numbers and paths for built-in menus.

-- New Library 222 commands --

Details commands available in Library 222.