Contents........................................................................................................................................................................................ 1

1. RPL Programming................................................................................................................................................................. 1-1

Understanding Programming .............................................................................................................................................1-1

The Contents of a Program ......................................................................................................................................... 1-1

Calculations in a Program ........................................................................................................................................... 1-2

Entering and Executing Programs......................................................................................................................................1-3

Viewing and Editing Programs ..........................................................................................................................................1-6

Creating Programs on a Computer .....................................................................................................................................1-7

Using Local Variables........................................................................................................................................................1-7

Creating Local Variables............................................................................................................................................. 1-7

Evaluating Local Names ............................................................................................................................................. 1-8

Defining the Scope of Local Variables ....................................................................................................................... 1-9

Compiled Local Variables......................................................................................................................................... 1-10

Creating User-Defined Functions as Programs......................................................................................................... 1-10

Using Tests and Conditional Structures ...........................................................................................................................1-11

Testing Conditions .................................................................................................................................................... 1-11

Using Conditional Structures and Commands .......................................................................................................... 1-13

Using Loop Structures......................................................................................................................................................1-17

Using Definite Loop Structures ................................................................................................................................ 1-17

Using Indefinite Loop Structures .............................................................................................................................. 1-21

Using Loop Counters ................................................................................................................................................ 1-24

Using Summations Instead of Loops ........................................................................................................................ 1-25

Using Flags.......................................................................................................................................................................1-25

Types of Flags........................................................................................................................................................... 1-26

Setting, Clearing, and Testing Flags ......................................................................................................................... 1-26

Recalling and Storing the Flag States ....................................................................................................................... 1-27

Using Subroutines ............................................................................................................................................................1-28

Single-Stepping through a Program .................................................................................................................................1-29

Trapping Errors ................................................................................................................................................................1-32

Causing and Analyzing Errors .................................................................................................................................. 1-32

Making an Error Trap ............................................................................................................................................... 1-33

Input .................................................................................................................................................................................1-35

Data Input Commands............................................................................................................................................... 1-35

Using PROMPT ... CONT for Input ........................................................................................................................ 1-35

Using DISP FREEZE HALT ... CONT for Input .................................................................................................... 1-37

Using INPUT ... ENTER for Input .......................................................................................................................... 1-38

Using INFORM and CHOOSE for Input.................................................................................................................. 1-42

Beeping to Get Attention .......................................................................................................................................... 1-45

Stopping a Program for Keystroke Input .........................................................................................................................1-46

Using WAIT for Keystroke Input ............................................................................................................................. 1-46

Using KEY for Keystroke Input ............................................................................................................................... 1-46

Output ....................................................................................................................................................................... 1-46

Data Output Commands............................................................................................................................................ 1-47

Labeling Output with Tags ....................................................................................................................................... 1-47

Labeling and Displaying Output as Strings .............................................................................................................. 1-48

Pausing to Display Output ........................................................................................................................................ 1-48

Using MSGBOX to Display Output ......................................................................................................................... 1-49

Using Menus with Programs ............................................................................................................................................1-49

Using Menus for Input .............................................................................................................................................. 1-50

Using Menus to Run Programs ................................................................................................................................. 1-50

Turning Off the hp49g+/hp48gII from a Program ...........................................................................................................1-52

2. RPL Programming Examples ................................................................................................................................................ 2-1

Fibonacci Numbers ............................................................................................................................................................2-1

Contents -1