HP HP-28S User Manual

BOXR (Ratio of Surface to Volume of a Box)
Given the height, width, and length of a box, calculate the ratio of its
surface to its volume.
Arguments Results
3:
height
3:
.~. ,
width 2:
'"" .
1 :
length 1 :
area/volume
Techniques:
• Nested user functions. BOXR is a user function whose defining ex-
pression uses BOXS in its calculation. In
turn, BOXR could be used
to define other user functions.
Recall
that BOXS was defined using h, w, and I as local variables,
and note below that BOXS takes x, y, and z as arguments in the
definition for BOXR. It makes no difference if the local variables in
the two definitions match, or if they don't match, because each set
of local variables is independent of the other. However, it's essential
that local variables be consistent within a single definition.
Program
"* ::< 1;:1 Z
, 80::-(:3 (::< .. '::I .. z::O
. / (::<l'::Ilz::O '
[ENTER [
o BOXR [STO[
Comments
Begin the program.
Create local variables for height,
width, and length. This program
uses x, y, and z, rather than h, w,
and l.
Begin the defining expression
with the user function BOXS.
Divide
by the volume of the box .
End the program.
Put the program on the stack.
Store
the program as BOXR.
28: Programming Examples 245

HP HP-28S Specifications

General

Brand	HP
Model	HP-28S
Category	Calculator
Language	English

Summary

HP-28S Advanced Scientific Calculator Owner's Manual

Part 1: Fundamentals

Introduces basic operations, calculator features, and core concepts.

Getting Started

Covers initial setup, basic operations, and calculator overview.

Doing Arithmetic

Explains methods for performing calculations using stack and expressions.

Part 2: Summary of Calculator Features

Objects

Describes fundamental data types, symbolic operations, and programming elements.

The Command Line

Explains input methods, cursor control, and command entry.

The Stack

Reviews stack concepts and commands for manipulating objects.

Part 3: Programming

Program Structures

Covers conditional logic, loops, and error handling in programs.

Conditional Structures

Explains testing conditions and making decisions within programs.

Definite Loop Structures

Details structures for executing code a specific number of times.

Appendixes & Indexes

Appendix A: Assistance, Batteries, and Service

Provides troubleshooting, battery info, and service details.

Answers to Common Questions

Addresses frequent user queries and common calculator issues.

Appendix B: Notes for HP RPN Calculator Users

Highlights differences for users familiar with RPN calculators.

Appendix D: Menu Map

Lists commands by menu, with descriptions and page references.

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