# BitConverter.Int64BitsToDouble(Int64) Method

## Definition

Reinterprets the specified 64-bit signed integer to a double-precision floating point number.

``````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``

#### Parameters

value
Int64

The number to convert.

#### Returns

A double-precision floating point number whose value is equivalent to `value`.

## Examples

The following code example converts the bit patterns of several Int64 values to Double values with the `Int64BitsToDouble` method.

``````// 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.
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
``````

## Remarks

Typically, `value` is an integer that is returned by the DoubleToInt64Bits method.