C# program to define all types of constants

 using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Collections;

using System.Threading;

using System.IO;

namespace CSharpProgram

{

    class AkbTechie

     {

            static void Main(string[] args)

                {

                    const int i = 15; //integer constant 

                    const float f = 10.45f; //float constant

                    const double d = 24.13; //double constant

                    const char c = 'A'; //character constant 

                    const string s = "Hello Techie"; //string constant

                    const bool b = true;  // Boolean Constant

                 

                    Console.WriteLine("Integer Constant: " + i);

                    Console.WriteLine("Float Constant: " + f);

                    Console.WriteLine("Double Constant: " + d);

                    Console.WriteLine("Character Constant: " + c);

                    Console.WriteLine("String Constant: " + s);

                    Console.WriteLine("Boolean Constant: " + b);

                    Console.ReadKey();   

          }

    }

}

Output:-

Integer Constant: 15

Float Constant: 10.45

Double Constant: 24.13

Character Constant: A

String Constant: Hello Techie

Boolean Constant: True