INTRO TO PROGRAMING - EVALUATE TI 89 or TI 92

INTRO TO PROGRAMING:
EVALUATE A FUNCTION - TI 89 or 92

Introduction
The instructions for entering, running, exiting, and editing are the same for any program. The actual program on this sheet allows you to quickly evaluate a function. This may be helpful when determining a reasonable window for graphing or investigating the value of a limit.
Information that is printed within {} is not typed into the calculator. Usually this contains instructions for finding a particular command. Anything in RED denotes a button on the calculator. For example + is the addition button. Anything in BLUE denotes a button on the calculator that requires hitting another button first. For example the QUIT command will appear here as QUIT because you need to hit the 2nd button first.

Your calculator manual will be very valuable for finding the commands and buttons needed for programming. If you have misplaced yours, visit the TI website to view a copy. TI Manuals

If you have a TI Connectivity Cable, you can download the program main.eval.89p

How to enter a new program

While on the Home screen, hit APPS. Open the PROGRAM EDITOR menu. Move the cursor to NEW. Hit ENTER.
Type in the name of the program in the box labeled VARIABLE. Choose a descriptive name up to 7 letters. Keep in mind that the program names will eventually appear alphabetized. These calculators treat programs just as they would variables. Be careful not to use a name for your program that already appears as a command in your calculator. Hit ENTER twice.
Now you are ready to type in each line of your program. You will notice that some lines have already appeared. Move your cursor to the first open line beginning with a : symbol.

Any words in the program that begin with an uppercase letter (Disp, for example) are actually commands. These models allow you to enter both uppercase and lowercase letters. That means you can type in the entire program letter by letter. But all commands can be found easily using CATALOG. To move quickly through the catalog, type in the first letter of the command you want to retrieve. You will move to the portion of the catalog that contains words starting with that letter.

The Program

This program has seven lines. Three lines will automatically appear. Hit ENTER at the end of each line. When you are finished, hit HOME.

:eval( )	{this will already appear assuming you named the program eval}
:Prgm	{this will already appear}
:Lbl p	{Lbl is in the CATALOG menu}
:Prompt x	{Prompt is in the F3 menu} {x is the X button}
:Disp y1(x)	{Disp is in the F3 menu} {y1 is the Y button followed by a 1}
:Goto p	{Goto is in the CATALOG menu}
:EndPrgm	{this will already appear}

How to run the program

In almost all programs you will need to enter a function into y1. Enter it just as you do when graphing.
While on the HOME screen, hit VAR-LINK . Move the cursor to the program name. Hit ENTER. Close the parentheses using the ) button. Hit ENTER
In the program above, you will be asked to enter a value of x. Type in the value and hit ENTER. The function value should appear followed by another request for a value of x.
When you are finished, hit ON, then ESC, and then HOME.