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Decimal Constructor (Int32, Int32, Int32, Boolean, Byte)

Initializes a new instance of Decimal from parameters specifying the instance's constituent parts.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public Decimal(
	int lo,
	int mid,
	int hi,
	bool isNegative,
	byte scale
)

Parameters

lo
Type: System.Int32
The low 32 bits of a 96-bit integer.
mid
Type: System.Int32
The middle 32 bits of a 96-bit integer.
hi
Type: System.Int32
The high 32 bits of a 96-bit integer.
isNegative
Type: System.Boolean
true to indicate a negative number; false to indicate a positive number.
scale
Type: System.Byte
A power of 10 ranging from 0 to 28.

ExceptionCondition
ArgumentOutOfRangeException

scale is greater than 28.

The binary representation of a Decimal number consists of a 1-bit sign, a 96-bit integer number, and a scaling factor used to divide the integer number and specify what portion of it is a decimal fraction. The scaling factor is implicitly the number 10 raised to an exponent ranging from 0 to 28.

The following code example creates several Decimal numbers using the constructor overload that initializes a Decimal structure with three Int32 value words, a Boolean sign, and a Byte scale factor.


// Example of the decimal( int, int, int, bool, byte ) constructor.
using System;

class DecimalCtorIIIBByDemo
{
    // Get the exception type name; remove the namespace prefix.
    public static string GetExceptionType( Exception ex )
    {
        string exceptionType = ex.GetType( ).ToString( );
        return exceptionType.Substring( 
            exceptionType.LastIndexOf( '.' ) + 1 );
    }

    // Create a decimal object and display its value.
    public static void CreateDecimal( int low, int mid, int high, 
        bool isNeg, byte scale )
    {
        // Format the constructor for display.
        string ctor = String.Format( 
            "decimal( {0}, {1}, {2}, {3}, {4} )", 
            low, mid, high, isNeg, scale );
        string valOrExc;

        try
        {
            // Construct the decimal value.
            decimal decimalNum = new decimal( 
                low, mid, high, isNeg, scale );

            // Format and save the decimal value.
            valOrExc = decimalNum.ToString( );
        }
        catch( Exception ex )
        {
            // Save the exception type if an exception was thrown.
            valOrExc = GetExceptionType( ex );
        }

        // Display the constructor and decimal value or exception.
        int ctorLen = 76 - valOrExc.Length;

        // Display the data on one line if it will fit.
        if ( ctorLen > ctor.Length )
            Console.WriteLine( "{0}{1}", ctor.PadRight( ctorLen ), 
                valOrExc );

        // Otherwise, display the data on two lines.
        else
        {
            Console.WriteLine( "{0}", ctor );
            Console.WriteLine( "{0,76}", valOrExc );
        }
    }

    public static void Main( )
    {

        Console.WriteLine( "This example of the decimal( int, int, " +
            "int, bool, byte ) \nconstructor " +
            "generates the following output.\n" );
        Console.WriteLine( "{0,-38}{1,38}", "Constructor", 
            "Value or Exception" );
        Console.WriteLine( "{0,-38}{1,38}", "-----------", 
            "------------------" );

        // Construct decimal objects from the component fields.
        CreateDecimal( 0, 0, 0, false, 0 );
        CreateDecimal( 0, 0, 0, false, 27 );
        CreateDecimal( 0, 0, 0, true, 0 );
        CreateDecimal( 1000000000, 0, 0, false, 0 );
        CreateDecimal( 0, 1000000000, 0, false, 0 );
        CreateDecimal( 0, 0, 1000000000, false, 0 );
        CreateDecimal( 1000000000, 1000000000, 1000000000, false, 0 );
        CreateDecimal( -1, -1, -1, false, 0 );
        CreateDecimal( -1, -1, -1, true, 0 );
        CreateDecimal( -1, -1, -1, false, 15 );
        CreateDecimal( -1, -1, -1, false, 28 );
        CreateDecimal( -1, -1, -1, false, 29 );
        CreateDecimal( int.MaxValue, 0, 0, false, 18 );
        CreateDecimal( int.MaxValue, 0, 0, false, 28 );
        CreateDecimal( int.MaxValue, 0, 0, true, 28 );
    }
}

/*
This example of the decimal( int, int, int, bool, byte )
constructor generates the following output.

Constructor                                               Value or Exception
-----------                                               ------------------
decimal( 0, 0, 0, False, 0 )                                               0
decimal( 0, 0, 0, False, 27 )                                              0
decimal( 0, 0, 0, True, 0 )                                                0
decimal( 1000000000, 0, 0, False, 0 )                             1000000000
decimal( 0, 1000000000, 0, False, 0 )                    4294967296000000000
decimal( 0, 0, 1000000000, False, 0 )          18446744073709551616000000000
decimal( 1000000000, 1000000000, 1000000000, False, 0 )
                                               18446744078004518913000000000
decimal( -1, -1, -1, False, 0 )                79228162514264337593543950335
decimal( -1, -1, -1, True, 0 )                -79228162514264337593543950335
decimal( -1, -1, -1, False, 15 )              79228162514264.337593543950335
decimal( -1, -1, -1, False, 28 )              7.9228162514264337593543950335
decimal( -1, -1, -1, False, 29 )                 ArgumentOutOfRangeException
decimal( 2147483647, 0, 0, False, 18 )                  0.000000002147483647
decimal( 2147483647, 0, 0, False, 28 )        0.0000000000000000002147483647
decimal( 2147483647, 0, 0, True, 28 )        -0.0000000000000000002147483647
*/


The following example uses the GetBits method to retrieve the component parts of an array. It then uses this array in the call to the Decimal constructor to instantiate a new Decimal value.


Module Example
   Public Sub Main()
      Dim values() As Decimal = { 1234.96d, -1234.96d }
      For Each value In values
         Dim parts() = Decimal.GetBits(value)
         Dim sign As Boolean = (parts(3) And &h80000000) <> 0
         Dim scale As Byte = CByte((parts(3) >> 16) And &H7F)

         Dim newValue As New Decimal(parts(0), parts(1), parts(2), sign, scale)    
         Console.WriteLine("{0} --> {1}", value, newValue)
      Next   
   End Sub
End Module
' The example displays the following output:
'    1234.96 --> 1234.96
'    -1234.96 --> -1234.96


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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