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C# / .NET - Math.Abs() method example

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Created by:

Barmar

338

The Math.Abs() function returns the absolute value of a number.

The absolute value of the number x denoted |x|, is the non-negative value of x without regard to its sign.

Popular usage examples:

xxxxxxxxxx
 
using System;
​
public class Program
{
    public static void Main(string[] args) 
    {
        Console.WriteLine( Math.Abs( 2 )); // 2
        Console.WriteLine( Math.Abs(-2 )); // 2
                           
        Console.WriteLine( Math.Abs( 2.54)); // 2.54
        Console.WriteLine( Math.Abs(-2.54)); // 2.54
                           
        Console.WriteLine( Math.Abs(  0   )); // 0
        Console.WriteLine( Math.Abs( 3 + 5)); // 8
        Console.WriteLine( Math.Abs( 3 - 5)); // 2
    }
}

1. Documentation

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Syntax	xxxxxxxxxx 1 namespace System 2 { 3 public static class Math 4 { 5 // ... 6 public static decimal Abs(decimal value) { ... } 7 public static double Abs(double value) { ... } 8 public static short Abs(short value) { ... } 9 public static int Abs(int value) { ... } 10 public static long Abs(long value) { ... } 11 public static sbyte Abs(sbyte value) { ... } 12 public static float Abs(float value) { ... } 13 // ... 14 } 15 }
Parameters	`value` - `decimal`, `double`, `short`, `int`, `long`, `sbyte` or `float` value (primitive value).
Result	The absolute value calculated from the `number` (primitive value).
Description	`Math.Abs()` is a static method that takes only one parameter and returns absolute number parameter value. The absolute value of the number x denoted \|x\|, is the non-negative value of x without regard to its sign.

2. Math.Abs() custom implementation

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xxxxxxxxxx
 
using System;
​
class Program
{
    static double Abs(double x) 
    {
        if (x < 0) {
            return -x;
        }
        return x;
    }
​
    static void Main(string[] args) 
    {
        Console.WriteLine( Abs(2.0) ); // 2
        Console.WriteLine( Abs(-2.0)); // 2
        Console.WriteLine( Abs(0.0) ); // 0
    }
}