What are the Constants in C# ??? with Free Notes

What are the Constants in C# ???

A Constants in C# is a value that cannot be changed after its declaration. Constants are defined using the “const” keyword and must be initialized at the time of declaration.

Syntax

const dataType constantName = value;

Example

using System;

namespace ConstantExample
{
    class Program
    {
        const int MaxValue = 100;
        const double Pi = 3.14159;
        const string WelcomeMessage = "Hello, World!";

        static void Main(string[] args)
        {
            Console.WriteLine("Max Value: " + MaxValue);
            Console.WriteLine("Pi: " + Pi);
            Console.WriteLine(WelcomeMessage);
        }
    }
}

Line-by-Line Notes

const int MaxValue = 100;

• Declares a constant integer named MaxValue and initializes it with the value 100.
• const: Keyword to declare a constant.
• int: Data type for a 32-bit signed integer.
• MaxValue: Name of the constant.
• 100: Initial and unchangeable value assigned to MaxValue.

const double Pi = 3.14159;

• Declares a constant double-precision floating-point number named Pi and initializes it with the value 3.14159.
• double: Data type for double-precision floating-point numbers.
• Pi: Name of the constant.
• 3.14159: Initial and unchangeable value assigned to Pi.

const string WelcomeMessage = "Hello, World!";

• Declares a constant string named WelcomeMessage and initializes it with the value "Hello, World!".
• string: Data type for a sequence of characters.
• WelcomeMessage: Name of the constant.
• "Hello, World!": Initial and unchangeable value assigned to WelcomeMessage.