Csharp/CSharp Tutorial/Data Type/double

comparison between double values

using System;
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        string comparison;
        Console.WriteLine("Enter a number:");
        double var1 = Convert.ToDouble(Console.ReadLine());
        Console.WriteLine("Enter another number:");
        double var2 = Convert.ToDouble(Console.ReadLine());
        if (var1 < var2)
            comparison = "less than";
        else {
            if (var1 == var2)
                comparison = "equal to";
            else
                comparison = "greater than";
        }
        Console.WriteLine("The first number is {0} the second number.",
                          comparison);
    }
}

double const

To declare a variable of type double, use a statement similar to that shown here:

double result;

Double: Epsilon, Positive/Negative Infinity and Max/Min Value

using System;
class MainClass
{
    public static void Main(string[] args)
    {
    Console.WriteLine("double.Epsilon: {0}", double.Epsilon);
    Console.WriteLine("double.PositiveInfinity: {0}",double.PositiveInfinity);
    Console.WriteLine("double.NegativeInfinity: {0}",double.NegativeInfinity);
    Console.WriteLine("double.MaxValue: {0}",double.MaxValue);
    Console.WriteLine("double.MinValue: {0}",double.MinValue);
    }
}

double.Epsilon: 4.94065645841247E-324
double.PositiveInfinity: Infinity
double.NegativeInfinity: -Infinity
double.MaxValue: 1.79769313486232E+308
double.MinValue: -1.79769313486232E+308

Exponential Notation

class MainClass
{
  static void Main()
  {
    System.Console.WriteLine(6.023E23f);
  }
}

Specifying a Literal double

class MainClass
{
  static void Main()
  {
    System.Console.WriteLine(1.618);
  }
}