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To create a character stream, wrap a byte stream inside one of the character stream wrappers At the top of the character stream hierarchy are the abstract classes TextReader and TextWriter TextReader handles input, and TextWriter handles output The methods defined by these two abstract classes are available to all of their subclasses Thus, they form a minimal set of I/O functions that all character streams will have Table 14-3 shows the input methods in TextReader In general, these methods can throw an IOException on error (Some can throw other types of exceptions, too) Of particular interest is the ReadLine( ) method, which reads an entire line of text, returning it as a string This method is useful when reading input that contains embedded spaces TextReader also specifies the Close( ) method, shown here: void Close( ) It closes the reader and frees its resources TextWriter defines versions of Write( ) and WriteLine( ) that output all of the built-in types For example, here are just a few of their overloaded versions:

Method void Write(int value) void Write(double value) void Write(bool value) void WriteLine(string value) void WriteLine(uint value) void WriteLine(char value) Description Writes an int Writes a double Writes a bool Writes a string followed by a newline Writes a uint followed by a newline Writes a char followed by a newline

In your next revision, you want to make sure your sentences aren t too long, your points are explicit, your tone is upbeat, and your construction is parallel EXERCISE 36: Calculate Your Average Sentence Length Take your time as you work with the four concepts described above to improve the drafts Sentences, you ll recall, should average fewer than fteen to twenty words Identify and correct misplaced modi ers and unde ned technical terminology Look for negative sentence constructions or words and rewrite to accentuate the positive And be certain there s consistency throughout the communication

Method int Peek( ) int Read( )

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Description Obtains the next character from the input stream, but does not remove that character Returns 1 if no character is available Returns an integer representation of the next available character from the invoking input stream Returns 1 when the end of the stream is encountered Attempts to read up to count characters into buffer starting at buffer[count], returning the number of characters successfully read Attempts to read up to count characters into buffer starting at buffer[index], returning the number of characters successfully read Reads the next line of text and returns it as a string Null is returned if an attempt is made to read at end-of-file Reads all of the remaining characters in a stream and returns them as a string

int Read(char[ ] buffer, int index, int count) int ReadBlock(char[ ] buffer, int index, int count) string ReadLine( ) string ReadToEnd( )

TABLE 14-3

2 =2 3 = 1 + 2

14:

All throw an IOException if an error occurs while writing TextWriter also specifies the Close( ) and Flush( ) methods shown here: virtual void Close( ) virtual void Flush( ) Flush( ) causes any data remaining in the output buffer to be written to the physical medium Close( ) closes the writer and frees its resources The TextReader and TextWriter classes are implemented by several character-based stream classes, including those shown here Thus, these streams provide the methods and properties specified by TextReader and TextWriter

Stream Class StreamReader StreamWriter StringReader StringWriter Description Reads characters from a byte stream This class wraps a byte input stream Writes characters to a byte stream This class wraps a byte output stream Reads characters from a string Writes characters to a string

In addition to the byte and character streams, there are two binary stream classes that can be used to read and write binary data directly These streams are called BinaryReader and BinaryWriter We will look closely at these later in this chapter when binary file I/O is discussed Now that you understand the general layout of the I/O system, the rest of this chapter will examine its various pieces in detail, beginning with console I/O

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