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# BigInteger.Abs Method

Visual Studio 2010

Gets the absolute value of a BigInteger object.

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

## Syntax

```public static BigInteger Abs(
BigInteger value
)
```

#### Parameters

value
Type: System.Numerics.BigInteger
A number.

#### Return Value

Type: System.Numerics.BigInteger
The absolute value of value.

## Remarks

The absolute value of a number is that number without its sign, as shown in the following table.

value parameter

Return value

value >= 0

value

value < 0

value * -1

The Abs method is equivalent to the Math.Abs method for the primitive numeric types.

## Examples

The following example uses the Abs method to convert a BigInteger value from two's complement representation to sign-and-magnitude representation before serializing it to a file. Data in the file is then deserialized and assigned to a new BigInteger object.

```
using System;
using System.IO;
using System.Numerics;
using System.Runtime.Serialization.Formatters.Binary;

[Serializable] public struct SignAndMagnitude
{
public int Sign;
public byte[] Bytes;
}

public class Example
{
public static void Main()
{
FileStream fs;
BinaryFormatter formatter = new BinaryFormatter();

BigInteger number = BigInteger.Pow(Int32.MaxValue, 20) * BigInteger.MinusOne;
Console.WriteLine("The original value is {0}.", number);
SignAndMagnitude sm = new SignAndMagnitude();
sm.Sign = number.Sign;
sm.Bytes = BigInteger.Abs(number).ToByteArray();

// Serialize SignAndMagnitude value.
fs = new FileStream(@".\data.bin", FileMode.Create);
formatter.Serialize(fs, sm);
fs.Close();

// Deserialize SignAndMagnitude value.
fs = new FileStream(@".\data.bin", FileMode.Open);
SignAndMagnitude smRestored = (SignAndMagnitude) formatter.Deserialize(fs);
fs.Close();
BigInteger restoredNumber = new BigInteger(smRestored.Bytes);
restoredNumber *= sm.Sign;
Console.WriteLine("The deserialized value is {0}.", restoredNumber);
}
}
// The example displays the following output:
//    The original value is -4.3510823966323432743748744058E+186.
//    The deserialized value is -4.3510823966323432743748744058E+186.

```

Supported in: 4

Supported in: 4

## Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.