Operation Manual

Chapter 16: Programming 279
4. Press Í to archive the program. An asterisk will appear to the left of the program to indicate it
is an archived program.
To unarchive a program in this screen, put the cursor next to the archived program and press Í.
The asterisk will disappear.
Note: Archive programs cannot be edited or executed. In order to edit or execute an archived
program, you must first unarchive it.
Entering Command Lines and Executing Programs
Entering a Program Command Line
You can enter on a command line any instruction or expression that you could execute from the home
screen. In the program editor, each new command line begins with a colon. To enter more than one
instruction or expression on a single command line, separate each with a colon.
Note: A command line can be longer than the screen is wide.
While in the program editor, you can display and select from menus. You can return to the program
editor from a menu in either of two ways.
• Select a menu item, which pastes the item to the current command line.
— or —
• Press ‘.
When you complete a command line, press Í. The cursor moves to the next command line.
Programs can access variables, lists, matrices, and strings saved in memory. If a program stores a new
value to a variable, list, matrix, or string, the program changes the value in memory during execution.
You can call another program as a subroutine.
Executing a Program
To execute a program, begin on a blank line on the home screen and follow these steps.
1. Press  to display the
PRGM EXEC menu.
2. Select a program name from the
PRGM EXEC menu. prgmname is pasted to the home screen (for
example,
prgmCYLINDER).
3. Press Í to execute the program. While the program is executing, the busy indicator is on.
Last Answer (
Ans) is updated during program execution. Last Entry is not updated as each command is
executed (Chapter 1).
The TI-84 Plus C checks for errors during program execution. It does not check for errors as you enter a
program.
Breaking a Program
To stop program execution, press É. The ERR:BREAK menu is displayed.
• To return to the home screen, select
1:Quit.
• To go where the interruption occurred, select
2:Goto.