C# .Exp()

The Math.Exp() method returns the value of raising e to the power of a given number.

e stands for Euler’s number, an irrational number, with an approximate constant value of 2.71828. It provides a constant base to the natural logarithm or log and can be understood as a limit of a given progression.

Consequently, the Math.Exp() method is the inverse of the Math.Log() method.

Syntax

Math.Exp(double n);

The method takes only one parameter; the variable n (number) of type double. The function will return a positive value of type double unless the value passed is one of the following:

• If n is 0, the function will return 1.
• If n is PositiveInfinity, the function will return PositiveInfinity.
• If n is NegativeInfinity, the function will return 0.
• If n is NaN, the function will return NaN.

Example

The following example applies the Math.Exp() method for six different values. The return values are printed with the Console.WriteLine() method.

using System;

namespace MathExpMethod
{
  public class Example
  {
    public static void Main(string[] args)
    {
      double firstCase = Math.Exp(1);
      double secondCase = Math.Exp(-1);
      double thirdCase = Math.Exp(0);
      double fourthCase = Math.Exp(double.PositiveInfinity);
      double fifthCase = Math.Exp(double.NegativeInfinity);
      double sixthCase = Math.Exp(double.NaN);

      Console.WriteLine(firstCase);
      Console.WriteLine(secondCase);
      Console.WriteLine(thirdCase);
      Console.WriteLine(fourthCase);
      Console.WriteLine(fifthCase);
      Console.WriteLine(sixthCase);
    }
  }
}

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This example results in the following output:

2.71828182845905
0.367879441171442
1
Infinity
0
NaN

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Codebyte Example

The following example is runnable and uses the Math.Exp() method to return the value of raising e to the power of the given double type number:

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