C# Const | C# Constants - c# - c# tutorial - c# net
C# Const
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.
Syntax:
const type constant_name;
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
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
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();
}
}
}
Code Explanation
- In this example const int SIDE =10 is a constant integer data.
- int area is specified as integer data type.
- In this example, here we are using the variable name as area, and area=SIDE*SIDE its store the constant value of 10.
- 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 :
- 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.