HP 48GII User Manual

RPL Programming 1-49
Using MSGBOX to Display Output
To set up a message box:
1. Enter a message string.
2. Execute the MSGBOX command.
Example: Enter the string I;<EELF!YLKE4I `.
Execute MSGBOX (!°L %OUT% %MSGBO%).
The following message appears:
You must acknowledge a message box by pressing %OK% or −.
Using Menus with Programs
You can use menus with programs for different purposes:
! Menu-based input. A program can set up a menu to get input during a halt in a program and then resume
executing the same program.
! Menu-based application. A program can set up a menu and finish executing, leaving the menu to start
executing other related programs.
To set up a built-in or library menu:
1. Enter the menu number.
2. Enter the MENU command (MODES MENU menu).
To set up a custom menu:
1. Enter a list (with f!h delimiters) or the name of a list defining the menu actions. If a list of two element lists
is given, the first element appears in the menu, but it is the second element that is returned to the stack when
the menu key is pressed. This second element can itself be a list with up to 3 objects, one for the menu key,
one for the left shift menu key and one for the right shift menu key.
2. Activate the menu:
! To save the menu as the CST menu, enter the MENU command (MODES MENU menu).
! To make the menu temporary, enter the TMENU command (MODES MENU menu).
The menu isn't displayed until program execution halts.
Menu numbers for built-in menus are listed in Appendix H. Library menus also have numbers — the library
number serves as the menu number. So you can activate applications menus (such as the SOLVE and PLOT
menus) and other menus (such as the VAR and CST menus) in programs. The menus behave just as they do
during normal keyboard operations.
You create a custom menu to cause the behavior you need in your program — see the topics that follow. You
can save the menu as the CST menu, so the user can get it again by pressing !£. Or you can make it
temporary — it remains active (even after execution stops), but only until a new menu is selected — and it
doesn't affect the contents of variable CST.

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.