語言

BitConverter.Int64BitsToDouble(Int64) 方法

定義

命名空間:
System
組件:
mscorlib.dll, System.Runtime.Extensions.dll
組件:
netstandard.dll, System.Runtime.dll
組件:
System.Runtime.Extensions.dll
組件:
mscorlib.dll
組件:
netstandard.dll
來源:
BitConverter.cs
來源:
BitConverter.cs
來源:
BitConverter.cs
來源:
BitConverter.cs
來源:
BitConverter.cs

將指定的 64 位元有符號整數重新詮釋為雙精度浮點數。

public:
 static double Int64BitsToDouble(long value);
public static double Int64BitsToDouble(long value);
static member Int64BitsToDouble : int64 -> double
Public Shared Function Int64BitsToDouble (value As Long) As Double

參數

value
Int64

要轉換的數位。

傳回

Double

一個雙精度浮點數，其值等同於 value。

範例

以下程式碼範例將多個 Int64 值 Double 的位元模式轉換為使用此 Int64BitsToDouble 方法的值。

// 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
*/

open System

let print obj1 obj2 = 
    printfn $"{obj1,20}{obj2,27:E16}"

// Reinterpret the long argument as a double.
let longBitsToDouble argument =
    let doubleValue = BitConverter.Int64BitsToDouble argument

    // Display the argument in hexadecimal.
    print (String.Format("0x{0:X16}", argument)) doubleValue

printfn "This example of the BitConverter.Int64BitsToDouble(Int64) \nmethod generates the following output.\n"
print "long argument" "double value"
print "-------------" "------------"

// 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 0xFFFFFFFFFFFFFFFFL
longBitsToDouble 0xFFF0000000000000L
longBitsToDouble 0x7FF0000000000000L
longBitsToDouble 0xFFEFFFFFFFFFFFFFL
longBitsToDouble 0x7FEFFFFFFFFFFFFFL
longBitsToDouble Int64.MinValue
longBitsToDouble Int64.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                         -∞
//   0x7FF0000000000000                          ∞
//   0xFFEFFFFFFFFFFFFF   -1.7976931348623157E+308
//   0x7FEFFFFFFFFFFFFF    1.7976931348623157E+308
//   0x8000000000000000    0.0000000000000000E+000
//   0x7FFFFFFFFFFFFFFF                        NaN

' Example of the BitConverter.Int64BitsToDouble method.
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

備註

通常 是 value 方法 DoubleToInt64Bits 回傳的整數。

適用於

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