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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 error individually, reporting more

Part I:

if(args[0] != "encode" & args[0] != "decode") { ConsoleWriteLine("First arg must be encode or decode"); return 1; // return failure code } // Encode or decode message for(int n=1; n < argsLength; n++) { for(int i=0; i < args[n]Length; i++) { if(args[0] == "encode") ConsoleWrite((char) (args[n][i] + 1) ); else ConsoleWrite((char) (args[n][i] - 1) ); } ConsoleWrite(" "); } ConsoleWriteLine(); return 0; } }

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 need to handle the other possible exceptions, depending upon the circumstances

To use the program, specify either the encode or decode command followed by the phrase that you want to encrypt or decrypt Assuming the program is called Cipher, here are two sample runs:

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To keep the code simple, the examples in this chapter catch only IOException, but your own code may need to handle other possible exceptions or handle the I/O exceptions individually

There are two interesting things in this program First, notice how the program checks that a command-line argument is present before it continues executing This is very important and can be generalized When a program relies on there being one or more command-line arguments, it must always confirm that the proper arguments have been supplied Failure to do this can lead to program malfunctions Also, since the first command-line argument must be either encode or decode, the program also checks this before proceeding Second, notice how the program returns a termination code If the required command line is not present, then 1 is returned, indicating abnormal termination Otherwise, 0 is returned when the program ends

In C#, a method can call itself This process is called recursion, and a method that calls itself is said to be recursive In general, recursion is the process of defining something in terms of itself and is somewhat similar to a circular definition The key component of a recursive method is that it contains a statement that executes a call to itself Recursion is a powerful control mechanism The classic example of recursion is the computation of the factorial of a number The factorial of a number N is the product of all the whole numbers between 1 and N For example, 3 factorial is 1 2 3, or 6 The following program shows a recursive way to

As mentioned, except when FileModeAppend is specified, the FileStream constructor just described opens a file with read/write access If you want to restrict access to just reading or just writing, use this constructor instead: FileStream(string filename, FileMode mode, FileAccess how) As before, filename specifies the name of the file to open, and mode specifies how the file will be opened The value passed in how determines how the file can be accessed It must be one of the values defined by the FileAccess enumeration, shown here:

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