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opital s Rule applies Hence limx + 1/x 2 = 0, l H sin(1/x 2 ) 1/x 2 x + [cos(1/x 2 )] [ 2/x 3 ] 2/x 3 x + cos(1/x 2 ) = 1 1 x +

Part I:

For example, this opens a read-only file:

FileStream fin = new FileStream("testdat", FileModeOpen, FileAccessRead);

When you are done with a file, you must close it This can be done by calling Close( ) Its general form is shown here: void Close( ) Closing a file releases the system resources allocated to the file, allowing them to be used by another file As a point of interest, Close( ) works by calling Dispose( ), which actually frees the resources

opital s Rule does not apply 1)] = 0 and limx + x + 1 = + , l H In fact the limit is 0 by inspection 2 2 (d) We rewrite the limit as limx + [ln x]/e x Since limx + ln x = opital s Rule applies Thus limx + e x = + , l H

it is no longer needed This approach is beneficial in many file-handling situations because it provides a simple means to ensure that a file is closed when it is no longer needed However, to clearly illustrate the fundamentals of file handling, including the point at which a file can be closed, this chapter explicitly calls Close( ) in all cases

FileStream defines two methods that read bytes from a file: ReadByte( ) and Read( ) To read a single byte from a file, use ReadByte( ), whose general form is shown here: int ReadByte( ) Each time it is called, it reads a single byte from the file and returns it as an integer value It returns 1 when the end of the file is encountered Possible exceptions include NotSupportedException (the stream is not opened for input) and ObjectDisposedException (the stream is closed) To read a block of bytes, use Read( ), which has this general form: int Read(byte[ ] array, int offset, int count) Read( ) attempts to read up to count bytes into array starting at array[offset] It returns the number of bytes successfully read An IOException is thrown if an I/O error occurs Several other types of exceptions are possible, including NotSupportedException, which is thrown if reading is not supported by the stream The following program uses ReadByte( ) to input and display the contents of a text file, the name of which is specified as a command-line argument Note the program first checks that a filename has been specified before trying to open the file

Diversi cation Diversi cation allows us to reduce our vulnerability to weather or labor unrest or zoning or taxation issues in Florida If these events occur in Florida, and we have more than one factory there, it is easy to no doubt see the problem

/* Display a text file To use this program, specify the name of the file that you want to see For example, to see a file called TESTCS, use the following command line ShowFile TESTCS */ using System; using SystemIO;

(e) We write the limit as limx x 4 /e 2x Since limx lim x 4 = opital s Rule applies Thus limx e 2x = + , l H x4 e 2x 4x 3 2x x 2e

14:

class ShowFile { static void Main(string[] args) { int i; FileStream fin; if(argsLength != 1) { ConsoleWriteLine("Usage: ShowFile File"); return; } try { fin = new FileStream(args[0], FileModeOpen); } catch(IOException exc) { ConsoleWriteLine("Cannot Open File"); ConsoleWriteLine(excMessage); return; // File can't be opened, so stop the program } // Read bytes until EOF is encountered try { do { i = finReadByte(); if(i != -1) ConsoleWrite((char) i); } while(i != -1); } catch(IOException exc) { ConsoleWriteLine("Error Reading File"); ConsoleWriteLine(excMessage); } finally { finClose(); } } }