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Contents

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..................................................................................................................................................1-9

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.................................................................................................................................1-22

Using Loop Counters.....................................................................................................................................................1-25

Using Summations Instead of Loops ..........................................................................................................................1-26

Using Flags ..............................................................................................................................................................................1-27

Types of Flags..................................................................................................................................................................1-27

Setting, Clearing, and Testing Flags.............................................................................................................................1-27

Recalling and Storing the Flag States...........................................................................................................................1-28

Using Subroutines ..................................................................................................................................................................1-29

Single-Stepping through a Program.....................................................................................................................................1-31

Trapping Errors......................................................................................................................................................................1-33

Causing and Analyzing Errors......................................................................................................................................1-33

Making an Error Trap....................................................................................................................................................1-35

Input.........................................................................................................................................................................................1-37

Data Input Commands ..................................................................................................................................................1-37

Using PROMPT, CONT for Input.............................................................................................................................1-37

Using DISP FREEZE HALT, CONT for Input......................................................................................................1-39

Using INPUT, ENTER for Input ...............................................................................................................................1-40

Using INFORM and CHOOSE for Input.................................................................................................................1-45

Beeping to Get Attention..............................................................................................................................................1-48

Stopping a Program for Keystroke Input...........................................................................................................................1-48

Using WAIT for Keystroke Input................................................................................................................................1-48

Using KEY for Keystroke Input..................................................................................................................................1-49

Output ..............................................................................................................................................................................1-49

Data Output Commands...............................................................................................................................................1-49

Labeling Output with Tags............................................................................................................................................1-50

Labeling and Displaying Output as Strings ................................................................................................................1-50

Pausing to Display Output............................................................................................................................................1-51

Using MSGBOX to Display Output...........................................................................................................................1-51

Using Menus with Programs ................................................................................................................................................1-52

Using Menus for Input...................................................................................................................................................1-52

Using Menus to Run Programs ....................................................................................................................................1-53

Turning Off the Calculator from a Program .....................................................................................................................1-55

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