In this article we will see a small example of using constants in c#. constants are declared with a keyword const .
> The program below is to find the area and perimeter of circle in which we use const .
> In the program below we have declared PI as a constant whose value is given as 3.14
It means PI value cannot be changed either at compile time or run-time .
> Any Integral or string variables can be declared as constants.
We can also declare constants as public to use it in all the classes in a program.
Sample Output :
> The program below is to find the area and perimeter of circle in which we use const .
> In the program below we have declared PI as a constant whose value is given as 3.14
It means PI value cannot be changed either at compile time or run-time .
> Any Integral or string variables can be declared as constants.
We can also declare constants as public to use it in all the classes in a program.
using System;
namespace Constants
{
class Program
{
static void Main(string[]
args)
{
//declaring
const variable PI
const
double PI = 3.14;
Console.WriteLine("*** www.ProgrammingPosts.blogspot.com ***");
Console.WriteLine(">>> c# Program to find Area and Perimeter
of Circle <<< \n");
Console.Write("Enter radius value: ");
int
r = Convert.ToInt32(Console.ReadLine());
double area
= PI * r * r;
Console.WriteLine("Are of circle is: " + area);
//if we
try to assign a value to PI , we get compile-time error
//PI =
123;
double
perimeter = 2 * PI * r;
Console.WriteLine("Perimeter of circle: " + perimeter);
Console.Read();
}
}
}
Sample Output :
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-Sameer