OnesComplement Operator

# BigInteger.OnesComplement Operator (BigInteger)

.NET Framework (current version)

Returns the bitwise one's complement of a BigInteger value.

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

## Syntax

```static let inline (null)
value:BigInteger : BigInteger
```

#### Parameters

value
Type: System.Numerics.BigInteger

An integer value.

#### Return Value

Type: System.Numerics.BigInteger

The bitwise one's complement of value.

## Remarks

The OnesComplement method defines the operation of the bitwise one's complement operator for BigInteger values. The bitwise one's complement operator reverses each bit in a numeric value. That is, bits in value that are 0 are set to 1 in the result, and bits that are 1 are set to 0 in the result. The OnesComplement method enables code such as the following:

No code example is currently available or this language may not be supported.

Languages that do not support custom operators may be able to call the OnesComplement method directly to perform a bitwise one's complement operation. For example:

```Imports System.Numerics

Module Example
Public Sub Main()
Dim value, complement As bigInteger

value = BigInteger.Multiply(BigInteger.One, 9)
complement = BigInteger.op_OnesComplement(value)

Console.WriteLine("{0,5} -- {1,-32}", value, DisplayInBinary(value))
Console.WriteLine("{0,5} -- {1,-32}", complement, DisplayInBinary(complement))
Console.WriteLine()

value = BigInteger.MinusOne * SByte.MaxValue
complement = BigInteger.op_OnesComplement(value)

Console.WriteLine("{0,5} -- {1,-32}", value, DisplayInBinary(value))
Console.WriteLine("{0,5} -- {1,-32}", complement, DisplayInBinary(complement))
Console.WriteLine()
End Sub

Private Function DisplayInBinary(number As BigInteger) As String
Dim bytes() As Byte = number.ToByteArray()
Dim binaryString As String = String.Empty
For Each byteValue As Byte In bytes
Dim byteString As String = Convert.ToString(byteValue, 2).Trim()
binaryString += byteString.Insert(0, New String("0"c, 8 - byteString.Length))
Next
Return binaryString
End Function
End Module
' The example displays the following output:
'           9 -- 00001001
'         -10 -- 11110110
'
'        -127 -- 10000001
'         126 -- 01111110
```

## Version Information

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone
Available since 8.1