Bool/Decimal/Dollar/sqrt in c#

concept of bool:


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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.Write("10 > 9 is  " + (10 > 9));
            Console.ReadLine();


        }
    }
}
//output is 10 >9 is true

--------------------------------Decimal----------------------------------

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {

            decimal price;
            decimal discount;
            decimal discounet_price;

            //compute discounted price;
            price = 100.00m;
            discount = .10m;
            discounet_price = price - (price * discount);

            Console.Write("discounted price : $" + discounet_price);
            Console.ReadLine();

            /*use of decimal it can be accurately represent to 28 decimal places
             * decimal constants are followed by suffix m*/



            decimal pie = 22m;
            decimal result;
            result = pie / 7;
            Console.Write(result);
            Console.ReadLine();


        }
    }
}
/* check the output... */

---------------------------------Dollar in c sharp-------------------------------------

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            decimal balance;
            balance = 100m;
            Console.WriteLine("current bqalance is {0:C}", balance);//$100.00
            Console.ReadLine();


        }
    }
}

-------------------------Sqrt-----------------

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {

            double r;
            double area;
            area =10.0;
            r = Math.Sqrt(area / 3.1416);

            Console.WriteLine(r);
            Console.ReadLine();


        }
    }
}
/* area = pie*r*r.... */