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Math.Abs Method (Int64)

Updated: September 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 Math.Abs(Int64) method to get the absolute value of several Int64 values.

long[] values = { Int64.MaxValue, 109013, 0, -6871982, Int64.MinValue };
foreach (long value in values)
      outputBlock.Text += String.Format("Abs({0}) = {1}", value, Math.Abs(value)) + "\n";
   catch (OverflowException)
      outputBlock.Text += String.Format("Unable to calculate the absolute value of {0}.",
                        value) + "\n";
// 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.


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.




September 2010

Added a definition of absolute value.

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