User Manual

Chapter 16: Programming 279
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 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.
Editing Programs
Editing a Program
To edit a stored program, follow these steps.
1. Press  ~ to display the PRGM EDIT menu.
2. Select a program name from the PRGM EDIT menu. Up to the first seven lines of the program
are displayed.
Note: The program editor does not display a $ to indicate that a program continues beyond the
screen.
3. Edit the program command lines.
• Move the cursor to the appropriate location, and then delete, overwrite, or insert.
• Press ‘ to clear all program commands on the command line (the leading colon
remains), and then enter a new program command.