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

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Created by:

Elleanor-Williamson

380

Math.Exp() is a static method that takes only one parameter and returns exponential function value in the range 0 (exclusive) to +Infinity.

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using System;
​
public class Program
{
    public static void Main(string[] args) 
    {
        Console.WriteLine( Math.Exp(  -100  ) ); // 3.720075976020836E-44
        Console.WriteLine( Math.Exp(    -1  ) ); // 0.36787944117144233
        Console.WriteLine( Math.Exp(     0  ) ); // 1
        Console.WriteLine( Math.Exp(     1  ) ); // 2.718281828459045
        Console.WriteLine( Math.Exp(   100  ) ); // 2.6881171418161356E43
​
        Console.WriteLine( Math.Exp( Double.NegativeInfinity ) ); // 0
        Console.WriteLine( Math.Exp( Double.PositiveInfinity ) ); //  ∞ / +Infinity
        Console.WriteLine( Math.Exp( Double.NaN ) ); // NaN
    }
}

1. Documentation

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Syntax	xxxxxxxxxx 1 namespace System 2 { 3 public static class Math 4 { 5 // ... 6 public static double Exp(double number) { ... } 7 // ... 8 } 9 }
Parameters	`number` - double value (primitive value).
Result	Exponential function value of a number in the range `0` (exclusive) to `+Infinity` (primitive value). If the value can not be calculated `NaN` is returned.
Description	`Math.Exp()` is a static method that takes only one parameter and returns exponential function value.

2. Reversed console plot example

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using System;
using System.Text;
​
public class Program
{
    static void PrintLine(double y1, double y2, double dy, string character)
    {
        StringBuilder line = new StringBuilder();
​
        for (double y = y1; y < y2; y += dy)
        {
            line.Append(" ");
        }
​
        Console.WriteLine(line + character);
    }
​
    public static void Main(string[] args)
    {
        double x1 = -4;   // beginning of sine chart
        double x2 = +2.8; // end of sine chart
​
        double y1 = -1.0;
        double y2 = +10.0;
​
        double xSteps = 25;
        double ySteps = 60;
​
        double dx = (x2 - x1) / xSteps; // x axis step
        double dy = (y2 - y1) / ySteps; // y axis step
​
        for (double rad = x1; rad < x2; rad += dx)
        {
            double y = Math.Exp(rad);
​
            if (y <= y1 || y >= y2)
            {
                Console.WriteLine(" ");
            }
            else
            {
                PrintLine(y1, y, dy, "+");
            }
        }
    }
}

Output: