Console.WriteLine(Math.Floor(- 1.5)) Console.WriteLine(Math.Ceiling(2.5)) => -2 => 3 in Visual Studio .NET

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Console.WriteLine(Math.Floor(- 1.5)) Console.WriteLine(Math.Ceiling(2.5)) => -2 => 3
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Atan2 returns the angle formed by an object of a given height y at a given distance x; it s similar to Atan, but it returns an unambiguous value for all the four quadrants. The IEEERemainder function returns the remainder of a division; it s therefore similar to the Mod operator but works correctly also with floating-point numbers:
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Console.WriteLine(Math.IEEERemainder(2, 1.5)) => 0.5
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Date and Time Functions
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The DateAndTime class includes several date and time functions, among which are DateAdd, DateDiff, DatePart, DateSerial, DateValue, Year, Month, Day, Hour, Minute,
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3:
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Control Flow and Error Handling
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Second, MonthName, Weekday, WeekdayName, TimeSerial, and TimeValue. This class also exposes two read-only properties, Now and Timer. In general, the syntax hasn t changed from Visual Basic 6 except for the DateAdd, DateDiff, and DatePart functions, which now can take an enumerated constant instead of a string constant:
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Get the date two weeks from now.
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newDate = DateAdd(DateInterval.WeekOfYear, 2, Now())
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The Visual Basic 6 syntax is still supported.
newDate = DateAdd( w", 2, Now())
You have two new properties to retrieve and set the current date and time:
Reset system time to midnight.
TimeOfDay = #12:00:00 PM#
Evaluate days left until December 31 of current year.
days = DateDiff(DateInterval.Day, Today, _
DateSerial(Year(Today), 12, 31))
These properties replace Time and Date respectively. The MonthName and Week dayName functions support an extra Boolean argument, to retrieve the abbreviated month or day name:
Console.WriteLine(MonthName(1, True)) => Jan
Interaction Commands and Functions
The Microsoft.VisualBasic.Interaction class exposes many useful commands and methods that were available in Visual Basic 6, including AppActivate, Beep, CallByName, Choose, Command, Environ, IIf, InputBox, MsgBox, Partition, Shell, and Switch. These methods are globally defined, so you don t have to include the class name when you use them:
MsgBox( Goodbye", MsgBoxStyle.Information)
The Shell function expands on the original version and supports an additional argu ment that enables you to specify whether to wait until the shelled program terminates, with an optional timeout. This solves an old problem known to many Visual Basic developers without your having to resort to Windows API functions:
Run Notepad.exe, and wait until the user terminates it.
Shell( notepad", AppWinStyle.NormalFocus, True)
Run Notepad, and then wait max 10 seconds.
Dim taskID As Long
taskId = Shell( notepad", AppWinStyle.NormalFocus, True, 10000)
If taskID = 0 Then
Console.WriteLine( Notepad has been closed within 10 seconds. ) Else Console.WriteLine( Notepad is still running after 10 seconds. ) End If
Part I:
The Basics
Other Commands, Functions, and Objects
The FileSystem class includes all the usual Visual Basic file commands and functions, including ChDir, ChDrive, CurDir, Dir, FileCopy, FileDateTime, FileLen, GetAttr, Kill, MkDir, RmDir, and SetAttr. There are no relevant differences from their counterparts under previous versions of the language, except that the new FileOpen, FileClose, FileGet, FilePut, PrintLine, InputLine, and InputString commands supersede the Open#, Close#, Get#, Put#, Print#, LineInput#, and Input statements (whose nonstandard syn tax can t be supported in Visual Basic .NET):
Read a text file.
Dim handle As Integer = FreeFile()
Open a file for input.
FileOpen(handle, C:\autoexec.bat", OpenMode.Input, OpenAccess. Read)
Read the entire file in one operation.
Dim fileText As String = InputString(handle, CInt(LOF(handle)))
Close the file.
FileClose(handle)
In most cases, however, you should avoid these file-related functions in the Microsoft.VisualBasic namespace and use other objects offered by the .NET Framework because you ll write more flexible code that way. See 9 for more details about .NET file and directory classes. The Conversion class provides support for functions such as Fix, Hex, Int, Oct, Str, and Val, which have the same syntax and meaning as under Visual Basic 6. This class also includes the ErrorToString function, which converts an error code to a description. The ErrorToString function is similar to Err.Description, but you don t need to have an actual error to retrieve the description associated with an error code:
Display the description associated with error code 9. Console.WriteLine(ErrorToString(9)) => Subscript out of range.
The Information class gathers miscellaneous functions, such as Erl, Err, IsArray, IsDate, IsError, IsNothing, IsNumeric, LBound, UBound, and TypeName. The IsEmpty and IsNull functions aren t supported because they made sense only with Variant arguments, which in turn aren t supported. However, the .NET Framework supports the DBNull data type (which represents a null value coming from a database field), and Visual Basic .NET conveniently exposes an IsDBNull function, which has therefore more or less the same meaning as IsNull.
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