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8-3-1
Editing Program Contents
8-3 Editing Program Contents
k Debugging a Program
A problem in a program that keeps the program from running correctly is called a “ bug,”
and the process of eliminating such problems is called “ debugging.” Either of the following
symptoms indicates that your program contains bugs that require debugging.
• Error messages appearing when the program is run
• Results that are not within your expectations
u To eliminate bugs that cause error messages
An error message, like the one shown below, appears whenever something illegal occurs
during program execution.
When such a message appears, press J to display the place in the program where the
error was caused. The cursor will be fl ashing at the location of the problem. Check the “Error
Message Table” (page
α
-1-1) for steps you should take to correct the situation.
• Note that pressing J does not display the location of the error if the program is
password protected. Instead, it returns to the program list screen.
u To eliminate bugs that cause bad results
If your program produces results that are not what you normally expect, check the
contents of the program and make necessary changes.
1 (TOP) ......Moves the cursor to the top of the
program
2 (BTM) ......Moves the cursor to the bottom of
the program