### 10.9 The try Statement ¶

The original form of a `try` block looks like this:

    try
      body
    catch
      cleanup
    end_try_catch

where body and cleanup are both optional and may contain any Octave expressions or commands. The statements in cleanup are only executed if an error occurs in body.

No warnings or error messages are printed while body is executing. If an error does occur during the execution of body, cleanup can use the functions `lasterr` or `lasterror` to access the text of the message that would have been printed, as well as its identifier. The alternative form,

    try
      body
    catch err
      cleanup
    end_try_catch

will automatically store the output of `lasterror` in the structure err. See Errors and Warnings, for more information about the `lasterr` and `lasterror` functions.