using System;
public class clsAtan
{
 
    public void Main()
    {
 
 
        //********************************************************************************
        // Purpose: converts a tangent to radians of an angle. The function 
        // takes a double data type number and returns a double value 
        // that repesents the radians of the angle for that tangent. 
        // (you can convert the radians to degrees by multiplying 
        // them by Math.PI/180)
        // 
        // Syntax: 	Atan(double)
        //  
        // Parameter1: double - The expression represents a tangent that 
        // is to be converted into radians of an angle. 
        // Any valid System.Double data type number between -1 and +1 
        // if number < -1 or > 1, NaN is returned - NaN stands for Not a Number
        //
        // Result: double - represents the radians of the angle of the 
        // tangent that was specified as the input parameter.
        //
        // Quick Example: Atan(90) // Returns 1.55968567289729
        //
        //********************************************************************************
        // This example is from http://idealprogrammer.com
 
        Console.WriteLine("Example #1: 	Atan(double)");
 
        Console.WriteLine(Math.Atan(90)); // Returns 1.55968567289729
 
        //write blank line to make output easier to read
        Console.WriteLine();
 
        Console.WriteLine("Example #2: 	Atan(double)");
 
        Console.WriteLine(Math.Atan(-3.4)); // Returns -1.28474488507758
        //write blank line to make output easier to read
        Console.WriteLine();
 
        Console.WriteLine("Example #3: 	Atan(double)");
 
        Console.WriteLine(Math.Atan(-0)); // Returns 0
 
        //Prevent console from closing before you press enter
        Console.ReadLine();
 
    }
 
}

Module Module1
 
    Sub Main()
 
 
        Dim myclsAtan As New clsAtan
        myclsAtan.Main()
 
 
 
    End Sub
 
End Module