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Math.Abs Method (Int64)

Returns the absolute value of a 64-bit signed integer.

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

public static long Abs(
	long value


Type: System.Int64

A number that is greater than Int64.MinValue, but less than or equal to Int64.MaxValue.

Return Value

Type: System.Int64
A 64-bit signed integer, x, such that 0 x Int64.MaxValue.


value equals Int64.MinValue.

The absolute value of an Int64 is its numeric value without its sign. For example, the absolute value of both 123 and -123 is 123.

The following example uses the Abs(Int64) method to get the absolute value of a number of Int64 values.

using System;

public class Example
   public static void Main()
      long[] values = { Int64.MaxValue, 109013, 0, -6871982, Int64.MinValue };
      foreach (long value in values)
         try {
            Console.WriteLine("Abs({0}) = {1}", value, Math.Abs(value));
         catch (OverflowException) {
            Console.WriteLine("Unable to calculate the absolute value of {0}.", 
// The example displays the following output: 
//       Abs(9223372036854775807) = 9223372036854775807 
//       Abs(109013) = 109013 
//       Abs(0) = 0 
//       Abs(-6871982) = 6871982 
//       Unable to calculate the absolute value of -9223372036854775808.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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