Double


using System;

/* A double value represents 64-bit double-precision floating point type */
public class DoubleExample
{

    static void Main(String[] args)
    {
        double x = 1.234, y = 1.5;  
        Console.WriteLine(x.GetType());
        Console.WriteLine(typeof(double));
        Console.WriteLine(double.MinValue);
        Console.WriteLine(double.MaxValue);
        double z = x + y;
        Console.WriteLine("Sum = " + z);
        Console.ReadLine();
    }

}

Output:
System.Double
System.Double
-1.79769313486232E+308
1.79769313486232E+308
Sum = 2.734