BitConverter.Int64BitsToDouble メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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BitConverter.Int64BitsToDouble メソッド

指定した 64 ビット符号付き整数を倍精度浮動小数点数に変換します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Shared Function Int64BitsToDouble
 ( _
    value As Long _
) As Double

Visual Basic (使用法)

Dim value As Long
Dim returnValue As Double

returnValue = BitConverter.Int64BitsToDouble(value)

public static double Int64BitsToDouble (
    long value
)

C++

public:
static double Int64BitsToDouble (
    long long value
)

public static double Int64BitsToDouble (
    long value
)

JScript

public static function Int64BitsToDouble
 (
    value : long
) : double

パラメータ

value: 変換する数値。

戻り値
value と等価の値を持つ倍精度浮動小数点数。

使用例

Int64BitsToDouble メソッドを使用して、複数の Int64 値のビットパターンを Double 値に変換するコード例を次に示します。

Visual Basic

' Example of the BitConverter.Int64BitsToDouble method.
Imports System
Imports Microsoft.VisualBasic

Module Int64BitsToDoubleDemo

    Const formatter As String
 = "{0,20}{1,27:E16}"
 
    ' Reinterpret the Long argument as a Double.
    Sub LongBitsToDouble( argument As Long
 )

        Dim doubleValue    As Double
        doubleValue = BitConverter.Int64BitsToDouble( argument )

        ' Display the argument in hexadecimal.
        Console.WriteLine( formatter, _
            String.Format( "0x{0:X16}",
 argument ), doubleValue )
    End Sub 
       
    Sub Main( )

        Console.WriteLine( _
            "This example of the BitConverter.Int64BitsToDouble(
 " & _
            "Long ) " & vbCrLf & "method
 generates the " & _
            "following output." & vbCrLf )
        Console.WriteLine( formatter, "Long argument",
 _
            "Double value" )
        Console.WriteLine( formatter, "-------------",
 _
            "------------" )
          
        ' Convert Long values and display the results.
        LongBitsToDouble( 0 )
        LongBitsToDouble( &H3FF0000000000000 )
        LongBitsToDouble( &H402E000000000000 )
        LongBitsToDouble( &H406FE00000000000 )
        LongBitsToDouble( &H41EFFFFFFFE00000 )
        LongBitsToDouble( &H3F70000000000000 )
        LongBitsToDouble( &H3DF0000000000000 )
        LongBitsToDouble( &H0000000000000001 )
        LongBitsToDouble( &H000000000000FFFF )
        LongBitsToDouble( &H0000FFFFFFFFFFFF )
        LongBitsToDouble( &HFFFFFFFFFFFFFFFF )
        LongBitsToDouble( &HFFF0000000000000 )
        LongBitsToDouble( &H7FF0000000000000 )
        LongBitsToDouble( &HFFEFFFFFFFFFFFFF )
        LongBitsToDouble( &H7FEFFFFFFFFFFFFF )
        LongBitsToDouble( Long.MinValue )
        LongBitsToDouble( Long.MaxValue )
    End Sub 
End Module

' This example of the BitConverter.Int64BitsToDouble( Long )
' method generates the following output.
' 
'        Long argument               Double value
'        -------------               ------------
'   0x0000000000000000    0.0000000000000000E+000
'   0x3FF0000000000000    1.0000000000000000E+000
'   0x402E000000000000    1.5000000000000000E+001
'   0x406FE00000000000    2.5500000000000000E+002
'   0x41EFFFFFFFE00000    4.2949672950000000E+009
'   0x3F70000000000000    3.9062500000000000E-003
'   0x3DF0000000000000    2.3283064365386963E-010
'   0x0000000000000001    4.9406564584124654E-324
'   0x000000000000FFFF    3.2378592100206092E-319
'   0x0000FFFFFFFFFFFF    1.3906711615669959E-309
'   0xFFFFFFFFFFFFFFFF                        NaN
'   0xFFF0000000000000                  -Infinity
'   0x7FF0000000000000                   Infinity
'   0xFFEFFFFFFFFFFFFF   -1.7976931348623157E+308
'   0x7FEFFFFFFFFFFFFF    1.7976931348623157E+308
'   0x8000000000000000    0.0000000000000000E+000
'   0x7FFFFFFFFFFFFFFF                        NaN

// Example of the BitConverter.Int64BitsToDouble method.
using System;

class Int64BitsToDoubleDemo
{
    const string formatter = "{0,20}{1
,27:E16}";
 
    // Reinterpret the long argument as a double.
    public static void LongBitsToDouble(
 long argument )
    {
        double doubleValue;
        doubleValue = BitConverter.Int64BitsToDouble( argument );

        // Display the argument in hexadecimal.
        Console.WriteLine( formatter, 
            String.Format( "0x{0:X16}", argument ), doubleValue );
    }
       
    public static void Main(
 )
    {
        Console.WriteLine(
            "This example of the BitConverter.Int64BitsToDouble( " +
            "long ) \nmethod generates the following output.\n" );
        Console.WriteLine( formatter, "long argument", 
            "double value" );
        Console.WriteLine( formatter, "-------------", 
            "------------" );
          
        // Convert long values and display the results.
        LongBitsToDouble( 0 );
        LongBitsToDouble( 0x3FF0000000000000 );
        LongBitsToDouble( 0x402E000000000000 );
        LongBitsToDouble( 0x406FE00000000000 );
        LongBitsToDouble( 0x41EFFFFFFFE00000 );
        LongBitsToDouble( 0x3F70000000000000 );
        LongBitsToDouble( 0x3DF0000000000000 );
        LongBitsToDouble( 0x0000000000000001 );
        LongBitsToDouble( 0x000000000000FFFF );
        LongBitsToDouble( 0x0000FFFFFFFFFFFF );
        LongBitsToDouble( unchecked( (long)0xFFFFFFFFFFFFFFFF ) );
        LongBitsToDouble( unchecked( (long)0xFFF0000000000000 ) );
        LongBitsToDouble( 0x7FF0000000000000 );
        LongBitsToDouble( unchecked( (long)0xFFEFFFFFFFFFFFFF ) );
        LongBitsToDouble( 0x7FEFFFFFFFFFFFFF );
        LongBitsToDouble( long.MinValue );
        LongBitsToDouble( long.MaxValue );
    }
}

/*
This example of the BitConverter.Int64BitsToDouble( long )
method generates the following output.

       long argument               double value
       -------------               ------------
  0x0000000000000000    0.0000000000000000E+000
  0x3FF0000000000000    1.0000000000000000E+000
  0x402E000000000000    1.5000000000000000E+001
  0x406FE00000000000    2.5500000000000000E+002
  0x41EFFFFFFFE00000    4.2949672950000000E+009
  0x3F70000000000000    3.9062500000000000E-003
  0x3DF0000000000000    2.3283064365386963E-010
  0x0000000000000001    4.9406564584124654E-324
  0x000000000000FFFF    3.2378592100206092E-319
  0x0000FFFFFFFFFFFF    1.3906711615669959E-309
  0xFFFFFFFFFFFFFFFF                        NaN
  0xFFF0000000000000                  -Infinity
  0x7FF0000000000000                   Infinity
  0xFFEFFFFFFFFFFFFF   -1.7976931348623157E+308
  0x7FEFFFFFFFFFFFFF    1.7976931348623157E+308
  0x8000000000000000    0.0000000000000000E+000
  0x7FFFFFFFFFFFFFFF                        NaN
*/

C++

// Example of the BitConverter::Int64BitsToDouble method.
using namespace System;

// Reinterpret the __int64 argument as a double.
void LongBitsToDouble( __int64 argument )
{
   double doubleValue;
   doubleValue = BitConverter::Int64BitsToDouble( argument );
   
   // Display the argument in hexadecimal.
   Console::WriteLine( "{0,20}{1,27:E16}", String::Format( "0x{0:X16}",
 argument ), doubleValue );
}

int main()
{
   Console::WriteLine( "This example of the BitConverter::Int64BitsToDouble(
 "
   "__int64 ) \nmethod generates the following output.\n" );
   Console::WriteLine( "{0,20}{1,27:E16}", "__int64 argument",
 "double value" );
   Console::WriteLine( "{0,20}{1,27:E16}", "----------------",
 "------------" );
   
   // Convert __int64 values and display the results.
   LongBitsToDouble( 0 );
   LongBitsToDouble( 0x3FF0000000000000 );
   LongBitsToDouble( 0x402E000000000000 );
   LongBitsToDouble( 0x406FE00000000000 );
   LongBitsToDouble( 0x41EFFFFFFFE00000 );
   LongBitsToDouble( 0x3F70000000000000 );
   LongBitsToDouble( 0x3DF0000000000000 );
   LongBitsToDouble( 0x0000000000000001 );
   LongBitsToDouble( 0x000000000000FFFF );
   LongBitsToDouble( 0x0000FFFFFFFFFFFF );
   LongBitsToDouble( 0xFFFFFFFFFFFFFFFF );
   LongBitsToDouble( 0xFFF0000000000000 );
   LongBitsToDouble( 0x7FF0000000000000 );
   LongBitsToDouble( 0xFFEFFFFFFFFFFFFF );
   LongBitsToDouble( 0x7FEFFFFFFFFFFFFF );
   LongBitsToDouble( Int64::MinValue );
   LongBitsToDouble( Int64::MaxValue );
}

/*
This example of the BitConverter::Int64BitsToDouble( __int64 )
method generates the following output.

    __int64 argument               double value
    ----------------               ------------
  0x0000000000000000    0.0000000000000000E+000
  0x3FF0000000000000    1.0000000000000000E+000
  0x402E000000000000    1.5000000000000000E+001
  0x406FE00000000000    2.5500000000000000E+002
  0x41EFFFFFFFE00000    4.2949672950000000E+009
  0x3F70000000000000    3.9062500000000000E-003
  0x3DF0000000000000    2.3283064365386963E-010
  0x0000000000000001    4.9406564584124654E-324
  0x000000000000FFFF    3.2378592100206092E-319
  0x0000FFFFFFFFFFFF    1.3906711615669959E-309
  0xFFFFFFFFFFFFFFFF                        NaN
  0xFFF0000000000000                  -Infinity
  0x7FF0000000000000                   Infinity
  0xFFEFFFFFFFFFFFFF   -1.7976931348623157E+308
  0x7FEFFFFFFFFFFFFF    1.7976931348623157E+308
  0x8000000000000000    0.0000000000000000E+000
  0x7FFFFFFFFFFFFFFF                        NaN
*/

// Example of the BitConverter.Int64BitsToDouble method.
import System.*;

class Int64BitsToDoubleDemo
{
    private static String formatter = "{0
,20}{1,27:E16}";

    // Reinterpret the long argument as a double.
    public static void LongBitsToDouble(long
 argument)
    {
        double doubleValue;
        doubleValue = BitConverter.Int64BitsToDouble(argument);

        // Display the argument in hexadecimal.
        Console.WriteLine(formatter, String.Format("0x{0:X16}", 
            (Int64)argument), (System.Double)doubleValue);
    } //LongBitsToDouble

    public static void main(String[]
 args)
    {
        Console.WriteLine("This example of the "
            + "BitConverter.Int64BitsToDouble( long )  "  
            + "\nmethod generates the following output.\n");
        Console.WriteLine(formatter, "long argument", "double value");
        Console.WriteLine(formatter, "-------------", "------------");

        // Convert long values and display the results.
        LongBitsToDouble(0);
        LongBitsToDouble(0x3FF0000000000000L);
        LongBitsToDouble(0x402E000000000000L);
        LongBitsToDouble(0x406FE00000000000L);
        LongBitsToDouble(0x41EFFFFFFFE00000L);
        LongBitsToDouble(0x3F70000000000000L);
        LongBitsToDouble(0x3DF0000000000000L);
        LongBitsToDouble(0x0000000000000001L);
        LongBitsToDouble(0x000000000000FFFFL);
        LongBitsToDouble(0x0000FFFFFFFFFFFFL);
        LongBitsToDouble(((long)0xFFFFFFFFFFFFFFFFL));
        LongBitsToDouble((long)0xFFF0000000000000L);
        LongBitsToDouble(0x7FF0000000000000L);
        LongBitsToDouble((long)0xFFEFFFFFFFFFFFFFL);
        LongBitsToDouble(0x7FEFFFFFFFFFFFFFL);
        LongBitsToDouble(Int64.MinValue);
        LongBitsToDouble(Int64.MaxValue);
    } //main
} //Int64BitsToDoubleDemo

/*
This example of the BitConverter.Int64BitsToDouble( long )
method generates the following output.

       long argument               double value
       -------------               ------------
  0x0000000000000000    0.0000000000000000E+000
  0x3FF0000000000000    1.0000000000000000E+000
  0x402E000000000000    1.5000000000000000E+001
  0x406FE00000000000    2.5500000000000000E+002
  0x41EFFFFFFFE00000    4.2949672950000000E+009
  0x3F70000000000000    3.9062500000000000E-003
  0x3DF0000000000000    2.3283064365386963E-010
  0x0000000000000001    4.9406564584124654E-324
  0x000000000000FFFF    3.2378592100206092E-319
  0x0000FFFFFFFFFFFF    1.3906711615669959E-309
  0xFFFFFFFFFFFFFFFF                        NaN
  0xFFF0000000000000                  -Infinity
  0x7FF0000000000000                   Infinity
  0xFFEFFFFFFFFFFFFF   -1.7976931348623157E+308
  0x7FEFFFFFFFFFFFFF    1.7976931348623157E+308
  0x8000000000000000    0.0000000000000000E+000
  0x7FFFFFFFFFFFFFFF                        NaN
*/

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
BitConverter クラス
BitConverter メンバ
System 名前空間

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BitConverter.Int64BitsToDouble メソッドとは？ わかりやすく解説

BitConverter.Int64BitsToDouble メソッド

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BitConverter.Int64BitsToDouble メソッドとは？わかりやすく解説