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You can use the System.Environment class to obtain information about the machine and environment, as the following example demonstrates: using System; using System.Collections; class Test { public static void Main() { Console.WriteLine("Command Line: {0}", Environment.CommandLine); Console.WriteLine("Current Directory: {0}", Environment.CurrentDirectory); Console.WriteLine("HasShutdownStarted: {0}", Environment.HasShutdownStarted); Console.WriteLine("Machine Name: {0}", Environment.MachineName); Console.WriteLine("OS Version: {0}", Environment.OSVersion); Console.WriteLine("ProcessorCount: {0}", Environment.ProcessorCount); Console.WriteLine("Stack Trace: {0}", Environment.StackTrace); Console.WriteLine("System Directory: {0}", Environment.SystemDirectory); Console.WriteLine("Tick Count: {0}", Environment.TickCount); Console.WriteLine("Version: {0}", Environment.Version); Console.WriteLine("UserDomainName: {0}", Environment.UserDomainName); Console.WriteLine("UserInteractive: {0}", Environment.UserInteractive); Console.WriteLine("UserName: {0}", Environment.UserName); Console.WriteLine("Working Set: {0}", Environment.WorkingSet);

sub add { $result = $_[0] + $_[1]; print "The result was: $result\n"; }

To call the subroutine and get a result,

MasterExam provides you with a simulation of the actual exams The number of questions, the type of questions, and the time allowed are intended to be an accurate representation of the exam environment You have the option to take an open-book exam, including hints, references, and answers, a closed-book exam, or the timed MasterExam simulation When you launch MasterExam, a digital clock display will appear in the bottom right-hand corner of your screen The clock will continue to count down to zero unless you choose to end the exam before the time expires

add(1,2);

The entire contents of the All-in-One Exam Guide are provided in PDF Adobe s Acrobat Reader has been included on the CD

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The preceding subroutine is fairly simple, but what if you wanted to have named arguments The simple answer is to assign the values of @_ to a list of variables:

A help file is provided through the help button on the main page in the lower lefthand corner An individual help feature is also available through MasterExam

sub add { ($numbera, $numberb) = @_; $result = $numbera + $numberb; print "The result was: $result\n"; }

Console.WriteLine("Environment Variables"); foreach (DictionaryEntry var in Environment.GetEnvironmentVariables()) Console.WriteLine(" {0}={1}", var.Key, var.Value); Console.WriteLine("Logical Drives"); foreach (string drive in Environment.GetLogicalDrives()) Console.WriteLine(" {0}", drive); } } When this runs, it generates the following output (results will vary on different machines): Command Line: "Z:\Nick\PIC#\Code\Accessing Environment Settings\bin\Debug\Accessing Environment Settings.vshost.exe" Current Directory: Z:\Nick\PIC#\Code\Accessing Environment Settings\bin\Debug HasShutdownStarted: False Machine Name: WINXP-VMWARE OS Version: Microsoft Windows NT 5.1.2600 Service Pack 2 ProcessorCount: 1 Stack Trace: at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo) at System.Environment.get_StackTrace() at Test.Main() in z:\nick\pic#\code\accessing environment settings\file_1.cs:line 16 at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.Utilities.HostProc. RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callBack, Object state, StackCrawlMark& stackMark) at System.Threading.ThreadHelper.ThreadStart() System Directory: C:\WINDOWS\system32 Tick Count: 10894000 Version: 2.0.41202.0 UserDomainName: WINXP-VMWARE UserInteractive: True UserName: User Working Set: 11493376

Note the syntax here we re assigning a list of values (from @_) to a list of variables ($numbera and $numberb) so we must supply a list of variables, enclosed in parentheses so that each value in @_ is assigned to a corresponding variable Finally, because we probably don t want to create those variables in the global name space, we ought to use my to declare them all locally:

Removing Installation(s)

sub add { my ($numbera, $numberb) = @_; my $result = $numbera + $numberb; print "The result was: $result\n"; }

MasterExam is installed to your hard drive For best results removing programs, use the Start | All Programs | LearnKey| Uninstall option to remove MasterExam

See the Scope section later in this chapter for information on the effects of my and the other scoping mechanisms

6:

For questions regarding the content of the electronic book or MasterExam, please visit wwwmhprofessionalcom or e-mail customerservice@mcgraw-hillcom For customers outside the 50 United States, e-mail international_cs@mcgraw-hillcom

The shift function is one of the stack operands supported by Perl The shift function returns (and removes) the first element of an array For example:

Environment Variables Path=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem TEMP=C:\DOCUME~1\User\LOCALS~1\Temp SESSIONNAME=Console PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH USERDOMAIN=WINXP-VMWARE PROCESSOR_ARCHITECTURE=x86 SystemDrive=C: APPDATA=C:\Documents and Settings\User\Application Data windir=C:\WINDOWS TMP=C:\DOCUME~1\User\LOCALS~1\Temp USERPROFILE=C:\Documents and Settings\User ProgramFiles=C:\Program Files FP_NO_HOST_CHECK=NO HOMEPATH=\Documents and Settings\User COMPUTERNAME=WINXP-VMWARE USERNAME=User NUMBER_OF_PROCESSORS=1 PROCESSOR_IDENTIFIER=x86 Family 15 Model 2 Stepping 8, GenuineIntel SystemRoot=C:\WINDOWS ComSpec=C:\WINDOWS\system32\cmd.exe LOGONSERVER=\\WINXP-VMWARE VS80COMNTOOLS=C:\Program Files\Microsoft Visual Studio 8\Common7\Tools\ WecVersionForRosebud.740=2 CommonProgramFiles=C:\Program Files\Common Files PROCESSOR_LEVEL=15 PROCESSOR_REVISION=0208 CLIENTNAME=Console ALLUSERSPROFILE=C:\Documents and Settings\All Users OS=Windows_NT HOMEDRIVE=C: Logical Drives A:\ C:\ D:\ Z:\

For technical problems with the software (installation, operation, removing installations), please visit wwwlearnkeycom, e-mail techsupport@learnkeycom, or call toll free at 1-800-482-8244

@list = qw/first second third/; $a = shift @list;

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