BitConverter.DoubleToInt64Bits(Double) Méthode

Référence

Définition

Espace de noms:: System

Assembly:: System.Runtime.Extensions.dll

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: BitConverter.cs

Source:: BitConverter.cs

Source:: BitConverter.cs

Important

Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.

Convertit le nombre à virgule flottante double précision spécifié en entier 64 bits signé.

public:
 static long DoubleToInt64Bits(double value);

public static long DoubleToInt64Bits (double value);

static member DoubleToInt64Bits : double -> int64

Public Shared Function DoubleToInt64Bits (value As Double) As Long

Paramètres

value: Double

Nombre à convertir.

Retours

Int64

Entier 64 bits signé dont la valeur équivaut à value.

Exemples

L’exemple de code suivant convertit les modèles de bits de plusieurs Double valeurs en Int64 valeurs avec la DoubleToInt64Bits méthode .

// Example of the BitConverter::DoubleToInt64Bits method.
using namespace System;

// Reinterpret the double argument as an __int64.
void DoubleToLongBits( double argument )
{
   __int64 longValue;
   longValue = BitConverter::DoubleToInt64Bits( argument );
   
   // Display the resulting __int64 in hexadecimal.
   Console::WriteLine( "{0,25:E16}{1,23:X16}", argument, longValue );
}

int main()
{
   Console::WriteLine( "This example of the BitConverter::DoubleToInt64Bits( "
   "double ) \nmethod generates the following output.\n" );
   Console::WriteLine( "{0,25:E16}{1,23:X16}", "double argument", "hexadecimal value" );
   Console::WriteLine( "{0,25:E16}{1,23:X16}", "---------------", "-----------------" );
   
   // Convert double values and display the results.
   DoubleToLongBits( 1.0 );
   DoubleToLongBits( 15.0 );
   DoubleToLongBits( 255.0 );
   DoubleToLongBits( 4294967295.0 );
   DoubleToLongBits( 0.00390625 );
   DoubleToLongBits( 0.00000000023283064365386962890625 );
   DoubleToLongBits( 1.234567890123E-300 );
   DoubleToLongBits( 1.23456789012345E-150 );
   DoubleToLongBits( 1.2345678901234565 );
   DoubleToLongBits( 1.2345678901234567 );
   DoubleToLongBits( 1.2345678901234569 );
   DoubleToLongBits( 1.23456789012345678E+150 );
   DoubleToLongBits( 1.234567890123456789E+300 );
   DoubleToLongBits( Double::MinValue );
   DoubleToLongBits( Double::MaxValue );
   DoubleToLongBits( Double::Epsilon );
   DoubleToLongBits( Double::NaN );
   DoubleToLongBits( Double::NegativeInfinity );
   DoubleToLongBits( Double::PositiveInfinity );
}

/*
This example of the BitConverter::DoubleToInt64Bits( double )
method generates the following output.

          double argument      hexadecimal value
          ---------------      -----------------
  1.0000000000000000E+000       3FF0000000000000
  1.5000000000000000E+001       402E000000000000
  2.5500000000000000E+002       406FE00000000000
  4.2949672950000000E+009       41EFFFFFFFE00000
  3.9062500000000000E-003       3F70000000000000
  2.3283064365386963E-010       3DF0000000000000
  1.2345678901230000E-300       01AA74FE1C1E7E45
  1.2345678901234500E-150       20D02A36586DB4BB
  1.2345678901234565E+000       3FF3C0CA428C59FA
  1.2345678901234567E+000       3FF3C0CA428C59FB
  1.2345678901234569E+000       3FF3C0CA428C59FC
  1.2345678901234569E+150       5F182344CD3CDF9F
  1.2345678901234569E+300       7E3D7EE8BCBBD352
 -1.7976931348623157E+308       FFEFFFFFFFFFFFFF
  1.7976931348623157E+308       7FEFFFFFFFFFFFFF
  4.9406564584124654E-324       0000000000000001
                      NaN       FFF8000000000000
                -Infinity       FFF0000000000000
                 Infinity       7FF0000000000000
*/

// Example of the BitConverter.DoubleToInt64Bits method.
using System;

class DoubleToInt64BitsDemo
{
    const string formatter = "{0,25:E16}{1,23:X16}";

    // Reinterpret the double argument as a long.
    public static void DoubleToLongBits( double argument )
    {
        long longValue;
        longValue = BitConverter.DoubleToInt64Bits( argument );

        // Display the resulting long in hexadecimal.
        Console.WriteLine( formatter, argument, longValue );
    }

    public static void Main( )
    {
        Console.WriteLine(
            "This example of the BitConverter.DoubleToInt64Bits( " +
            "double ) \nmethod generates the following output.\n" );
        Console.WriteLine( formatter, "double argument",
            "hexadecimal value" );
        Console.WriteLine( formatter, "---------------",
            "-----------------" );

        // Convert double values and display the results.
        DoubleToLongBits( 1.0 );
        DoubleToLongBits( 15.0 );
        DoubleToLongBits( 255.0 );
        DoubleToLongBits( 4294967295.0 );
        DoubleToLongBits( 0.00390625 );
        DoubleToLongBits( 0.00000000023283064365386962890625 );
        DoubleToLongBits( 1.234567890123E-300 );
        DoubleToLongBits( 1.23456789012345E-150 );
        DoubleToLongBits( 1.2345678901234565 );
        DoubleToLongBits( 1.2345678901234567 );
        DoubleToLongBits( 1.2345678901234569 );
        DoubleToLongBits( 1.23456789012345678E+150 );
        DoubleToLongBits( 1.234567890123456789E+300 );
        DoubleToLongBits( double.MinValue );
        DoubleToLongBits( double.MaxValue );
        DoubleToLongBits( double.Epsilon );
        DoubleToLongBits( double.NaN );
        DoubleToLongBits( double.NegativeInfinity );
        DoubleToLongBits( double.PositiveInfinity );
    }
}

/*
This example of the BitConverter.DoubleToInt64Bits( double )
method generates the following output.

          double argument      hexadecimal value
          ---------------      -----------------
  1.0000000000000000E+000       3FF0000000000000
  1.5000000000000000E+001       402E000000000000
  2.5500000000000000E+002       406FE00000000000
  4.2949672950000000E+009       41EFFFFFFFE00000
  3.9062500000000000E-003       3F70000000000000
  2.3283064365386963E-010       3DF0000000000000
  1.2345678901230000E-300       01AA74FE1C1E7E45
  1.2345678901234500E-150       20D02A36586DB4BB
  1.2345678901234565E+000       3FF3C0CA428C59FA
  1.2345678901234567E+000       3FF3C0CA428C59FB
  1.2345678901234569E+000       3FF3C0CA428C59FC
  1.2345678901234569E+150       5F182344CD3CDF9F
  1.2345678901234569E+300       7E3D7EE8BCBBD352
 -1.7976931348623157E+308       FFEFFFFFFFFFFFFF
  1.7976931348623157E+308       7FEFFFFFFFFFFFFF
  4.9406564584124654E-324       0000000000000001
                      NaN       FFF8000000000000
                -Infinity       FFF0000000000000
                 Infinity       7FF0000000000000
*/

open System

let print obj1 obj2 = 
    printfn $"{obj1,25:E16}{obj2,23:X16}"

// Reinterpret the double argument as a long.
let doubleToLongBits argument =
    let longValue = BitConverter.DoubleToInt64Bits argument

    // Display the resulting long in hexadecimal.
    print argument longValue

printfn "This example of the BitConverter.DoubleToInt64Bits(Double) \nmethod generates the following output.\n"
print "double argument" "hexadecimal value"
print "---------------" "-----------------"

// Convert double values and display the results.
doubleToLongBits 1.0
doubleToLongBits 15.0
doubleToLongBits 255.0
doubleToLongBits 4294967295.0
doubleToLongBits 0.00390625
doubleToLongBits 0.00000000023283064365386962890625
doubleToLongBits 1.234567890123E-300
doubleToLongBits 1.23456789012345E-150
doubleToLongBits 1.2345678901234565
doubleToLongBits 1.2345678901234567
doubleToLongBits 1.2345678901234569
doubleToLongBits 1.23456789012345678E+150
doubleToLongBits 1.234567890123456789E+300
doubleToLongBits Double.MinValue
doubleToLongBits Double.MaxValue
doubleToLongBits Double.Epsilon
doubleToLongBits Double.NaN
doubleToLongBits Double.NegativeInfinity
doubleToLongBits Double.PositiveInfinity


// This example of the BitConverter.DoubleToInt64Bits( double )
// method generates the following output.

//           double argument      hexadecimal value
//           ---------------      -----------------
//   1.0000000000000000E+000       3FF0000000000000
//   1.5000000000000000E+001       402E000000000000
//   2.5500000000000000E+002       406FE00000000000
//   4.2949672950000000E+009       41EFFFFFFFE00000
//   3.9062500000000000E-003       3F70000000000000
//   2.3283064365386963E-010       3DF0000000000000
//   1.2345678901230000E-300       01AA74FE1C1E7E45
//   1.2345678901234500E-150       20D02A36586DB4BB
//   1.2345678901234565E+000       3FF3C0CA428C59FA
//   1.2345678901234567E+000       3FF3C0CA428C59FB
//   1.2345678901234569E+000       3FF3C0CA428C59FC
//   1.2345678901234569E+150       5F182344CD3CDF9F
//   1.2345678901234569E+300       7E3D7EE8BCBBD352
//  -1.7976931348623157E+308       FFEFFFFFFFFFFFFF
//   1.7976931348623157E+308       7FEFFFFFFFFFFFFF
//   4.9406564584124654E-324       0000000000000001
//                       NaN       FFF8000000000000
//                        -∞       FFF0000000000000
//                         ∞       7FF0000000000000

' Example of the BitConverter.DoubleToInt64Bits method.
Module DoubleToInt64BitsDemo

    Const formatter As String = "{0,25:E16}{1,23:X16}"
 
    ' Reinterpret the Double argument as a Long.
    Sub DoubleToLongBits( argument As Double )

        Dim longValue    As Long
        longValue = BitConverter.DoubleToInt64Bits( argument )

        ' Display the resulting Long in hexadecimal.
        Console.WriteLine( formatter, argument, longValue )
    End Sub 
       
    Sub Main( )

        Console.WriteLine( _
            "This example of the BitConverter.DoubleToInt64Bits( " & _
            "Double ) " & vbCrLf & "method generates the " & _
            "following output." & vbCrLf )
        Console.WriteLine( formatter, "Double argument", _
            "hexadecimal value" )
        Console.WriteLine( formatter, "---------------", _
            "-----------------" )
          
        ' Convert Double values and display the results.
        DoubleToLongBits( 1.0 )
        DoubleToLongBits( 15.0 )
        DoubleToLongBits( 255.0 )
        DoubleToLongBits( 4294967295.0 )
        DoubleToLongBits( 0.00390625 )
        DoubleToLongBits( 0.00000000023283064365386962890625 )
        DoubleToLongBits( 1.234567890123E-300 )
        DoubleToLongBits( 1.23456789012345E-150 )
        DoubleToLongBits( 1.2345678901234565 )
        DoubleToLongBits( 1.2345678901234567 )
        DoubleToLongBits( 1.2345678901234569 )
        DoubleToLongBits( 1.23456789012345678E+150 )
        DoubleToLongBits( 1.234567890123456789E+300 )
        DoubleToLongBits( Double.MinValue )
        DoubleToLongBits( Double.MaxValue )
        DoubleToLongBits( Double.Epsilon )
        DoubleToLongBits( Double.NaN )
        DoubleToLongBits( Double.NegativeInfinity )
        DoubleToLongBits( Double.PositiveInfinity )
    End Sub 
End Module

' This example of the BitConverter.DoubleToInt64Bits( Double )
' method generates the following output.
' 
'           Double argument      hexadecimal value
'           ---------------      -----------------
'   1.0000000000000000E+000       3FF0000000000000
'   1.5000000000000000E+001       402E000000000000
'   2.5500000000000000E+002       406FE00000000000
'   4.2949672950000000E+009       41EFFFFFFFE00000
'   3.9062500000000000E-003       3F70000000000000
'   2.3283064365386963E-010       3DF0000000000000
'   1.2345678901230000E-300       01AA74FE1C1E7E45
'   1.2345678901234500E-150       20D02A36586DB4BB
'   1.2345678901234565E+000       3FF3C0CA428C59FA
'   1.2345678901234567E+000       3FF3C0CA428C59FB
'   1.2345678901234569E+000       3FF3C0CA428C59FC
'   1.2345678901234569E+150       5F182344CD3CDF9F
'   1.2345678901234569E+300       7E3D7EE8BCBBD352
'  -1.7976931348623157E+308       FFEFFFFFFFFFFFFF
'   1.7976931348623157E+308       7FEFFFFFFFFFFFFF
'   4.9406564584124654E-324       0000000000000001
'                       NaN       FFF8000000000000
'                 -Infinity       FFF0000000000000
'                  Infinity       7FF0000000000000

Remarques

L’ordre des bits dans l’entier retourné par la DoubleToInt64Bits méthode varie selon que l’architecture de l’ordinateur est little-endian ou big-endian.

S’applique à

Voir aussi

Int64BitsToDouble(Int64)

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