Programming
701
Debugging programs and handling errors
After you write a function or program, you can use several techniques to
find and correct errors. You can also build an error-handling command
into the function or program itself.
If your function or program allows the user to select from several
options, be sure to run it and test each option.
Techniques for debugging
Run-time error messages can locate syntax errors but not errors in
program logic. The following techniques may be useful.
•
Temporarily insert
Disp
commands to display the values of critical
variables.
•
To confirm that a loop is executed the correct number of times, use
Disp
to display the counter variable or the values in the conditional
test.
•
To confirm that a subroutine is executed, use
Disp
to display
messages such as “Entering subroutine” and “Exiting subroutine” at
the beginning and end of the subroutine.
•
To stop a program or function manually,
–
Windows®:
Hold down the
F12
key and press
Enter
repeatedly.
–
Macintosh®:
Hold down the
F5
key and press
Enter
repeatedly.
–
Handheld:
Hold down the
c
key and press
·
repeatedly.
Error-handling commands
Command
Description
Try...EndTry
Defines a block that lets a function or program execute
a command and, if necessary, recover from an error
generated by that command.
Clears the error status and sets system variable to zero.
For an example of using , see the command in the
Reference Guide
.
PassErr
Passes an error to the next level of the
Try...EndTry
block.
Summary of Contents for TI-Nspire
Page 38: ...26 Setting up the TI Nspire Navigator Teacher Software ...
Page 46: ...34 Getting started with the TI Nspire Navigator Teacher Software ...
Page 84: ...72 Using the Content Workspace ...
Page 180: ...168 Capturing Screens ...
Page 256: ...244 Embedding documents in web pages ...
Page 336: ...324 Polling students ...
Page 374: ...362 Using the Review Workspace ...
Page 436: ...424 Calculator ...
Page 450: ...438 Using Variables ...
Page 602: ...590 Using Lists Spreadsheet ...
Page 676: ...664 Using Notes You can also change the sample size and restart the sampling ...
Page 684: ...672 Libraries ...
Page 714: ...702 Programming ...
Page 828: ...816 Data Collection and Analysis ...
Page 846: ...834 Regulatory Information ...
Page 848: ...836 ...