HP HP-28S User Manual

Example. Calculate the ratio of surface to volume for a box 9 inches
high, 18 inches wide, and 21 inches long; make the calculation first in
RPN and then in algebraic syntax.
For the RPN version, first enter the height and width.
~ 3:
9 [ ENTER I 2: 9
. . 1: 18
18 I ENTER I 1IilD1IlIHI ___ _
Then key in the length and execute BOXR.
21 BOXR
The ratio is .428571428571.
Now try the algebraic version.
o BOXR [09.18.21 [EVALI
Again, the ratio is .428571428571.
Fibonacci Numbers
3:
2:
1: .428571428571
1IilD1IlIHI ___ _
3:
2: .428571428571
1: .428571428571
1IilD1IlIHI ___ _
Given an integer n, calculate the nth Fibonacci number F
n
,
where
This section includes two programs, each demonstrating an approach
to this problem .
• FIBI is a user function that is defined recursively-its defining ex-
pression contains its own name. FIB! is short, easy to understand,
and can be used with symbolic arguments.
• FIB2 is a user function defined with a program. It executes faster
than FIBl, but cannot be used with symbolic arguments.
246 28: Programming Examples

HP HP-28S Specifications

General

Introduced	1988
Memory	32 KB
Number of Digits	12
Type	Scientific Calculator
Manufacturer	Hewlett-Packard (HP)
Display	LCD
Processor	Saturn
Programming	RPL

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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