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(f) Since limx ln |x| = limx e 2x = + , l H opital s Rule applies Thus ln |x| 1/x = lim = 0 2x 2x x e x 2e lim 3 (a) We write the limit as limx + x 2 /e x Since limx + x 2 = opital s Rule applies Thus limx + e x = + , l H lim x 2 e x = lim x2 2x = lim x x e x + e

Description Output is appended to the end of file Creates a new output file Any preexisting file by the same name will be destroyed Creates a new output file The file must not already exist Opens a preexisting file Opens a file if it exists, or creates the file if it does not already exist Opens a preexisting file, but reduces its length to zero

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filename/path is too long), NotSupportedException (the filename specifies an unsupported device), and DirectoryNotFoundException (specified directory is invalid) The exceptions PathTooLongException, DirectoryNotFoundException, and FileNotFoundException are subclasses of IOException Thus, it is possible to catch all three by catching IOException There are many ways to handle the process of opening a file The following shows one way It opens a file called testdat for input

Since limx + sin(1/x 2 ) =

Did you make any other changes to Brad s version How about to your own draft EXERCISE 38: Con rm That It s Positive Read both versions, your own and Brad s, to con rm that the message is delivered in a positive manner If you discover a negative construction, rewrite it to make it positive Did you find any negative language If so, did you rewrite the words or phrases to make them positive in tone Brad did He said, I found it very interesting I was able to turn around the negative tone of the last answer and in doing so made the communication much stronger Brad noted that phrases and words such as we are vulnerable and problems alerted him to the negative tone Also, he realized that the reference to his assistant s lack of knowledge highlighted a negative fact: ignorance He decided that the entire sentence could be deleted Here s his revision:

FileStream fin = null; try { fin = new FileStream("test", FileModeOpen); } catch(IOException exc) { // catch all I/O exceptions ConsoleWriteLine(excMessage); // Handle the error } catch(Exception exc { // catch any other exception ConsoleWriteLine(excMessage); // Handle the error, if possible // Rethrow those exceptions that you don't handle }

Here, the first catch clause handles situations in which the file is not found, the path is too long, the directory does not exist, or other I/O errors occur The second catch, which is a catch all clause for all other types of exceptions, handles the other possible errors (possibly by rethrowing the exception) You could also check for each exception individually, reporting more specifically the problem that occurred and taking remedial action specific to that error For the sake of simplicity, the examples in this book will catch only IOException, but your real-world code may (probably will) need to handle the other possible exceptions, depending upon the circumstances Also, the exception handlers in this chapter simply report the error, but in many cases, your code should take steps to correct the problem when possible For example, you might reprompt the user for a filename if the one previously entered is not found You might also need to rethrow the exception

your own code may need to handle other possible exceptions or handle each type of I/O exception individually As mentioned, the FileStream constructor just described opens a file that (in most cases) has read/write access If you want to restrict access to just reading or just writing, use this constructor instead: FileStream(string path, FileMode mode, FileAccess access) As before, path specifies the name of the file to open, and mode specifies how the file will be opened The value passed in access specifies how the file can be accessed It must be one of the values defined by the FileAccess enumeration, which are shown here: