HP HP-28S User Manual

• String operations. PAD demonstrates how to convert an object to
string form,
count the number of characters, and concatenate two
strings.
Program
«
-tSTR
WHILE
DUP SIZE
REPEAT
II
II
SWAP
END
»
I ENTER I
CJ PAD I STO I
23
<
+
Comments
Begin the program.
Make sure the object is in string
form. (Strings are unaffected
by
this command.)
Begin WHILE clause.
Does the string contain fewer
than 23 characters?
Begin
REPEAT clause.
Add a leading space.
End REPEAT clause.
End the program.
Put the program on the stack.
Store the program as PAD.
Example. PAD is demonstrated in the program BDISP.
PRESERVE (Save and Restore Previous Status)
Given a program on the stack, store the current status, execute the
program,
and then restore the previous status.
Arguments Results
1 :
«
program
»
1 : (result of program)
Techniques:
• RCLF and STOF. PRESERVE uses RCLF (recall [lags) to record the
current status of the calculator in a binary integer and STOF (store
[lags) to restore the status from that binary integer.
258 28: Programming Examples
I

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.

Contacting Hewlett-Packard