C# Math - Log2() Method

The C# Log2() method returns the base-2 logarithm of a given number. In special cases it returns the following:

If the argument is NaN or less than zero, the method returns NaN.
If the argument is positive infinity, the method returns positive infinity.
If the argument is zero, the method returns negative infinity.

Syntax

public static double Log2 (double arg);

Parameters

arg Specify the number whose logarithm is to be found.

Return Value

Returns the base-2 logarithm of a given number.

Example:

In the example below, Log2() method is used to calculate the base-2 logarithm of a given number.

using System;

class MyProgram {
  static void Main(string[] args) {
    Console.WriteLine("Math.Log2(0) = "
                      + Math.Log2(0));
    Console.WriteLine("Math.Log2(10) = "
                      + Math.Log2(10));
    Console.WriteLine("Math.Log2(50) = "
                      + Math.Log2(50));
    Console.WriteLine("Math.Log2(Double.NaN) = "
                      + Math.Log2(Double.NaN));
    Console.WriteLine("Math.Log2(Double.NegativeInfinity) = "
                      + Math.Log2(Double.NegativeInfinity));
    Console.WriteLine("Math.Log2(Double.PositiveInfinity) = "
                      + Math.Log2(Double.PositiveInfinity));
  }
}

The output of the above code will be:

Math.Log2(0) = -Infinity
Math.Log2(10) = 3.321928094887362
Math.Log2(50) = 5.643856189774724
Math.Log2(Double.NaN) = NaN
Math.Log2(Double.NegativeInfinity) = NaN
Math.Log2(Double.PositiveInfinity) = Infinity

❮ C# Math Methods