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C# Const

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How to define constants in C# ?

  • In constants, the const keyword to declare a constant field or a constant local.
  • Constant fields and locals be located variables and may not be modified.
  • Constants can be numbers, Boolean values, strings, or a null reference.
  • Don’t generate a constant to represent information that we expect to change at any time.
  • The constants are treated just like regular variables except that their values cannot be modified after their definition.
 C conditional operators output

Syntax:

const type constant_name;
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Types of Constant:

    • Integer constants
    • Floating-point constants
    • Character Constants
    • String constants

Integer constants:

  • An "integer constant" is a decimal (base 10), octal (base 8), or hexadecimal (base 16) number that represents an integral value.
  • Integer constants are used to represent integer values that cannot be changed

Example:

6, -179, 0, 23858, +50, 025, 0X6
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Example of Literals
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Floating-point constants

  • A floating-point has an integer part, a decimal point, a fractional part, and an exponent part.

Example:

3.3445,  236754E-5L,  239E , 784f, .e35  
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Character Constants

  • Character constant are enclosed in single quotes ( ‘ ’ ). For example, 'w' and it can be stored in a simple variable of char type.
\\ \ character
\' ' character
\" " character
\? ? character
\n New line Formation
\r Carriage return
\f Form feed
\a Alert or bell
\b Backspace
\v Vertical tab
\t Horizontal tab
\ooo Octal number of one to 3 digits
\xhh . . . Hexadecimal number of one or more digits

String constants:

  • A string contains characters that are similar to character constants:
    • Plain characters,
    • Escape sequences, and
    • Universal characters.

C# Sample Code - C# Examples

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

namespace wikitechy_const
{
    class Program
    {
        static void Main(string[] args)
        {
            const int SIDE = 10;

            int area;

            area=SIDE*SIDE;

            Console.WriteLine("The area of the square with SIDE:{0}, is: {1} sq. units",SIDE,area);

            Console.ReadLine();
        }
    }
}
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Code Explanation

 c# code explannation
  1. In this example const int SIDE =10 is a constant integer data.
  2. int area is specified as integer data type.
  3. In this example, here we are using the variable name as area, and area=SIDE*SIDE its store the constant value of 10.
  4. In this example, "The area of the square with SIDE" is represented as a console statement. SIDE is constant integer variable. area is specified as integer data type.

Sample C# examples - Output :

 c# code output
  1. Here in this output "The area of the square with SIDE" is represented as a statement. And 10 is specifies the integer variable, 100 is specifies the area square of integer value 100.


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