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Function 2. Select 3:New. 3. Specify the applicable information for the new program or function. Item Type Folder Variable Lets you: Select whether to create a new program or function. Select the folder in which the new program or function will be stored. For information about folders, refer to Chapter 5. Type a variable name for the program or function. If you specify a variable that already exists, an error message will be displayed when you press .. When you press Nor .to acknowledge the error, the NEW dialog box is redisplayed. Note:A program (or function) is saved automatically as you type. You do not need to save it manually before leaving the Program Editor, starting a new program, or opening a previous one. 4. Press .(after typing in an input box such as Variable, you must press .twice) to display an empty “template.” This is the template for a program. Functions have a similar template. You can now use the Program Editor as described in the remaining sections of this chapter. 280 Chapter 17: Programming Resuming the Current Program Resuming the Current Program Opening a Previous Program Note:By default, Variable shows the first existing program or function in alphabetical order. Copying a Program Note about Deleting a Program You can leave the Program Editor and go to another application at any time. To return to the program or function that was displayed when you left the Program Editor, press O7 and select 1:Current . To leave the current program or function and start a new one: 1. Press .and select 3:New . 2. Specify the type, folder, and variable for the new program or function. 3. Press .twice. You can open a previously created program or function at any time. 1. From within the Program Editor, press .and select 1:Open . — or — From another application, press O7 and select 2:Open . 2. Select the applicable type, folder, and variable. 3. Press .. In some cases, you may want to copy a program or function so that you can edit the copy while retaining the original. 1. Display the program or function you want to copy. 2. Press .and select 2:Save Copy As . 3. Specify the folder and variable for the copy. 4. Press .twice. Because all Program Editor sessions are saved automatically, you can accumulate quite a few previous programs and functions, which take up memory storage space. To delete programs and functions, use the VAR-LINK screen ( 2°). For information about VAR-LINK , refer to Chapter 21. Chapter 17: Programming 281 Overview of Entering a Program order (although some commands alter the program flow). In general, anything that can be executed from the Home screen can be included in a program. Program execution continues until it reaches the end of the program or a Stop command. Overview of Entering a Program order (although some commands alter the program flow). In general, anything that can be executed from the Home screen can be included in a program. Program execution continues until it reaches the end of the program or a Stop command. Entering and Editing Program Lines Note:Use the cursor pad to scroll through the program for entering or editing commands. Use.Cor .Dto go to the top or bottom of a program, respectively. Note:Entering a command does not execute that command. It is not executed until you run the program. Entering Multi- Command Lines Entering Comments Tip:Use comments to enter information that is useful to someone reading the program code. On a blank template, you can begin entering commands for your new program. Program name, which you specify when you create a new program. Enter your program commands between Prgm and EndPrgm. All program lines begin with a colon. You enter and edit program commands in the Program Editor by using the same techniques used to enter and edit text in the Text Editor. Refer to “Entering and Editing Text” in Chapter 18. After typing each program line, press .. This inserts a new blank line and lets you continue entering another line. A program line can be longer than one line on the screen; if so, it will wrap to the next screen line automatically. To enter more than one command on the same line, separate them with a colon by pressing 2E. A comment symbol (¦) lets you enter a remark in a program. When you run the program, all characters to the right of ¦are ignored. :prog1() :Prgm Description of the :¦Displays sum of 1 thru n program. :Request "Enter an integer",n Description of expr. :expr(n)!n:¦Convert to numeric expression :----- To enter the comment symbol, press: ¦ TI.89: .d TI.92 Plus: 2X — or — ¦ Press .and select 9:¦ 282 Chapter 17: Programming Controlling the Flow of a Program Controlling the Flow of a Program Using Indentation Displaying Calculated Results Tip:For a list of available output commands, refer to page 302. Getting Values into a Program Tip:For a list of available input commands, refer to page 301. When you run a program, the program lines are executed in sequential order. However, some commands alter the program flow. For ex...
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