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Math.Abs Method (Int64)

Updated: August 2010

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 obtain the absolute value of several Int64 values.

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.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0




August 2010

Added a definition of absolute value.

Customer feedback.

October 2008

Replaced the example.

Customer feedback.