HP HP-28S User Manual

2. The loop clause 44~:1 .1 BEEP is executed.
3. The command NEXT adds 1 to the counter.
4. The current counter value is compared with the final counter
value .
• If the current counter value doesn't exceed the final counter
value, steps (2), (3), and (4) are repeated .
• If the current counter value exceeds the final counter value,
the definite loop structure is completed, and program execu-
tion continues after the NEXT command.
In this example, steps (2), (3), and (4) are repeated four times. The
loop counter is first incremented from 1 to 2, then to 3, then to 4, and
then to 5. At this point it exceeds the final value 4, so the definite
loop
structure ends. Note that step (1) is performed before any tests
are
made, so the loop clause is always evaluated at least once. For
another example of START '" NEXT, see "FIB2 (Fibonacci Numbers,
Loop Version)" on page 248.
FOR counter ... NEXT
In many cases it's handy to use the current value of the counter as a
variable in the loop clause. To do so, replace START by FOR name.
The counter becomes a local variable with the specified name. As be-
fore, this manual follows the convention of writing local names in
lowercase letters to help you distinguish them from global names. The
following example puts the first five square integers on the stack.
1 5 FOR x x SQ NEXT
The sequence FOR x is executed only once. The sequence.-.. :::;Q is
the loop clause, which is executed repeatedly.
26: Program Structures 229

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