By using C# Print the area of Circle on console .

CODE:

using System;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Text;

namespaceAreaofCircle

{

classProgram

    {

staticvoid Main(string[] args)

        {

int r;

constdouble π = 3.142;

double A;

Console.WriteLine("Please Enter radius:");

            r = Convert.ToInt32(Console.ReadLine());

            A = π * r * r;

Console.WriteLine(" with radius {0} the area of circle is {1}", r, A);

        }

    }

}

OUTPUT: