Constants in C#

Our first program will demonstrate constants of character, string, boolean, and numeric values.

using System;

public class Program
{
    const string s = "constant";

    public static void Main()
    {
        Console.WriteLine(s);

        // A `const` statement can appear anywhere a `var` statement can.
        const int n = 500000000;

        // Constant expressions perform arithmetic with arbitrary precision.
        const double d = 3e20 / n;
        Console.WriteLine(d);

        // A number can be given a type by using it in a context that requires one,
        // such as a variable assignment or a function call.
        Console.WriteLine((long)d);

        // Example: math.Sin expects a `double`.
        Console.WriteLine(Math.Sin(n));
    }
}

To run the program, save the code into a Program.cs file and use the csc (C# compiler) to compile it, then run the resulting executable file.

$ csc Program.cs
$ Program.exe
constant
6E+11
600000000000
-0.28470407323754404

Constants are a fundamental part of many languages, allowing for compile-time constants and optimization. Having now understood constants in C#, let’s proceed to explore other language features and constructs.

Variables in C#

For in C#

Learn X By Example

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Constants in C#