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Did you make signi cant changes Brad did He said, I made every one of those errors and I spotted some other mistakes I d made, too I realized I had some sentence fragments, for example, that I hadn t noticed until I focused on the sentences The rst thing Brad did was calculate his average sentence length He counted 272 words and eighteen sentences, equaling an average sentence length of fteen words Except, Brad explained, that that included those sentence fragments I decided I needed to rewrite the text so there were no fragments rst, and then recalculate my average sentence length While I was doing that, remembering that shorter sentences are always better than longer ones, I tried to tighten up all the sentences In doing so, I deleted a lot of verbiage Here s Brad s revision:

Console I/O is accomplished through the standard streams ConsoleIn, ConsoleOut, and ConsoleError Console I/O has been used since 2, so you are already familiar with it As you will see, it has some additional capabilities Before we begin, however, it is important to emphasize a point made earlier in this book: Most real applications of C# will not be text-based, console programs Rather, they will be graphically oriented programs or components that rely upon a windowed interface for interaction with the user, or will be server-side code Thus, the portion of the I/O system that relates to console input and output is not widely used Although text-based programs are excellent as teaching examples, for short utility programs, and for some types of components, they are not suitable for most real-world applications

ConsoleIn is an instance of TextReader, and you can use the methods and properties defined by TextReader to access it However, you will usually use the methods provided by Console, which automatically read from ConsoleIn Console defines three input methods The first two, Read( ) and ReadLine( ), have been available since NET Framework 10 The third, ReadKey( ), was added by NET Framework 20

Part I:

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To read a single character, use the Read( ) method: static int Read( ) Read( ) returns the next character read from the console It waits until the user presses a key and then returns the result The character is returned as an int, which must be cast to char Read( ) returns 1 on error This method will throw an IOException on failure When using Read( ), console input is line-buffered, so you must press enter before any character that you type will be sent to your program Here is a program that reads a character from the keyboard using Read( ):

// Read a character from the keyboard using System; class KbIn { static void Main() { char ch; ConsoleWrite("Press a key followed by ENTER: "); ch = (char) ConsoleRead(); // get a char ConsoleWriteLine("Your key is: " + ch); } }

Here is a sample run:

The fact that Read( ) is line-buffered is a source of annoyance at times When you press enter, a carriage-return, line-feed sequence is entered into the input stream Furthermore, these characters are left pending in the input buffer until you read them Thus, for some applications, you may need to remove them (by reading them) before the next input operation (To read keystrokes from the console in a non-line-buffered manner, you can use ReadKey( ), described later in this section) To read a string of characters, use the ReadLine( ) method It is shown here: static string ReadLine( ) ReadLine( ) reads characters until you press enter and returns them in a string object This method will throw an IOException if an I/O error occurs Here is a program that demonstrates reading a string from ConsoleIn by using ReadLine( ):

5

// Input from the console using ReadLine() using System; class ReadString { static void Main() { string str;