c# math.sqrt() method example

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using System;

public class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine( Math.Sqrt(  4   ) ); //  2
        Console.WriteLine( Math.Sqrt(  9   ) ); //  3

        Console.WriteLine( Math.Sqrt(  2   ) ); //  1.4142135623730951
        Console.WriteLine( Math.Sqrt(  0.5 ) ); //  0.7071067811865476
        Console.WriteLine( Math.Sqrt(  0   ) ); //  0
        Console.WriteLine( Math.Sqrt( -1   ) ); //  NaN
    }
}