HP 15c Collector's Edition User Manual

Section 7: Program Editing 87
Insertions and Deletions
After an insertion, the display will show the instruction you just added.
After a deletion, the display will show the line prior to the deleted (now
nonexistent) one.
If all space available in memory is occupied, the calculator will not accept
any program instruction insertions and Error 4 will be displayed.
Initializing Calculator Status
The contents of storage registers and the status of calculator settings will
affect a program if the program uses those registers or depends on a
certain status setting. If the current status is incorrect for the program
being run, you will get incorrect results. Therefore, it is wise to clear
registers and set relevant modes either just prior to running a program or
within the program itself. A self-initializing program is more mistake-
proof—but it also uses more program lines.
Calculator-initializing functions are: ´ CLEAR ∑, ´ CLEAR
M, ´ CLEAR Q, | D, | R, | g, | F,
and | ".
Problems
It is good programming technique to avoid using identical program labels.
(This shouldn’t be hard, since the HP 15c provides 25 different labels.) To
ensure against duplication of labels, you can clear program memory first.
1.
The following program is used by the manager of a savings and loan
company to compute the future values of savings accounts
according to the formula FV = PV(1 + i)
n
, where FV
is future value,
PV is present value, i is the periodic interest rate, and n
is the
number of periods. Enter PV first (into the Y-register) and n
second
(into the X-
register) before executing the program. Given is an
annual interest rate of 7.5% (so i = 0.075).

HP 15c Collector's Edition Specifications

General

Model	HP 15c Collector's Edition
Category	Calculator
Type	Scientific
Power Source	Battery
Manufacturer	HP
Display	LCD
Functions	complex numbers, matrix operations

Summary

Introduction

This Handbook

Outlines the structure of the manual, detailing its parts and how to use it for learning.

The HP Community

Discusses user groups and websites for HP calculator enthusiasts and information sharing.

Part I: HP 15c Fundamentals

Section 1: Getting Started

Covers basic operations like powering on, keyboard layout, and primary/alternate functions.

Section 2: Numeric Functions

Explains essential numeric operations including logs, trig, powers, and conversions.

Section 3: The Automatic Memory Stack, LAST X, and Data Storage

Details the RPN stack, LAST X register, and data storage operations.

Part II: HP 15c Programming

Section 6: Programming Basics

Introduces core programming concepts: creating, loading, running programs, and memory.

Section 8: Program Branching and Controls

Covers controlling program flow using branching, loops, and conditional tests.

Part III: HP 15c Advanced Functions

Section 11: Calculating With Complex Numbers

Covers entering, manipulating, and performing calculations with complex numbers.

Section 12: Calculating With Matrices

Explains matrix operations, including dimensioning, element access, and calculations.

Section 13: Finding the Roots of an Equation

Details using the SOLVE function for numerical root finding and equation solving.

Section 14: Numerical Integration

Explains how to perform numerical integration using the ∫f(x)dx key and subroutines.

Appendix A: Error Conditions

Error 8: No Root

Explains the error when the SOLVE function cannot find a root.

Error 0: Improper Mathematics Operation

Lists and explains errors related to mathematical operations and illegal arguments.

Appendix D: A Detailed Look at SOLVE

How SOLVE Works

Explains the numerical technique and logic behind the SOLVE algorithm.

Finding Several Roots

Discusses methods for finding multiple roots of an equation using the SOLVE function.