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In the program, notice how the end of the file is determined When the reference returned by ReadLine( ) is null, the end of the file has been reached Although this approach works, StreamReader provides an alternative means of detecting the end of the stream: the EndOfStream property This read-only property is true when the end of the stream has been reached and false otherwise Therefore, you can use EndOfStream to watch for the end of a file For example, here is another way to write the while loop that reads the file:

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while(!fstr_inEndOfStream) { s = fstr_inReadLine(); ConsoleWriteLine(s); }

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In this case, the use of EndOfStream makes the code a bit easier to understand but does not change the overall structure of the sequence There are times, however, when the use of EndOfStream can simplify an otherwise tricky situation, adding clarity and improving structure As with StreamWriter, in some cases, you might find it easier to open a file directly using StreamReader To do so, use this constructor: StreamReader(string path) Here, path specifies the name of the file to open, which can include a full path specifier The file must exist If it doesn t, a FileNotFoundException is thrown If path is null, then an ArgumentNullException is thrown If path is an empty string, ArgumentException is thrown IOException and DirectoryNotFoundException are also possible

As mentioned earlier, the standard streams, such as ConsoleIn, can be redirected By far, the most common redirection is to a file When a standard stream is redirected, input and/or output is automatically directed to the new stream, bypassing the default devices By redirecting the standard streams, your program can read commands from a disk file, create log files, or even read input from a network connection Redirection of the standard streams can be accomplished in two ways First, when you execute a program on the command line, you can use the < and > operators to redirect ConsoleIn and/or ConsoleOut, respectively For example, given this program:

using System; class Test { static void Main() { ConsoleWriteLine("This is a test"); } }

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will cause the line This is a test to be written to a file called log Input can be redirected in the same way The thing to remember when input is redirected is that you must make sure that what you specify as an input source contains sufficient input to satisfy the demands of the program If it doesn t, the program will hang The < and > command-line redirection operators are not part of C#, but are provided by the operating system Thus, if your environment supports I/O redirection (as is the case with Windows), you can redirect standard input and standard output without making any changes to your program However, there is a second way that you can redirect the standard streams that is under program control To do so, you will use the SetIn( ), SetOut( ), and SetError( ) methods, shown here, which are members of Console: static void SetIn(TextReader newIn) static void SetOut(TextWriter newOut) static void SetError(TextWriter newError) Thus, to redirect input, call SetIn( ), specifying the desired stream You can use any input stream as long as it is derived from TextReader To redirect output, call SetOut( ), specifying the desired output stream, which must be derived from TextWriter For example, to redirect output to a file, specify a FileStream that is wrapped in a StreamWriter The following program shows an example:

// Redirect ConsoleOut using System; using SystemIO; class Redirect { static void Main() { StreamWriter log_out = null; try { log_out = new StreamWriter("logfiletxt"); // Redirect standard out to logfiletxt ConsoleSetOut(log_out); ConsoleWriteLine("This is the start of the log file"); for(int i=0; i<10; i++) ConsoleWriteLine(i); ConsoleWriteLine("This is the end of the log file"); } catch(IOException exc) { ConsoleWriteLine("I/O Error\n" + excMessage); } finally { if(log_out != null) log_outClose(); } } }

(x 3) 6/5 dx = lim (x 3) 1/5 1/5

Part I:

Here s Brad s revision:

When you run this program, you won t see any of the output on the screen, but the file logfiletxt will contain the following: