using System;

public class Program

{

    public static void Main()

    {

        char ch;

        float w,l,r,area=0,PI;

        Console.WriteLine("==================================");

        Console.WriteLine("          Manu         ");

        Console.WriteLine("==================================");

        Console.WriteLine("Press c or C : Find Area of Circle");

        Console.WriteLine("Press s or S : Find Area of Square");

        Console.WriteLine("==================================");

        Console.Write("Inpur your choice :");

        ch = char.Parse(Console.ReadLine());

        if (ch == 's' || ch == 'S')

        {

            Console.WriteLine("\nYou choose \"Square\" ");

            Console.Write("Input width : ");

            w = float.Parse(Console.ReadLine());

            Console.Write("Input length : ");

            l = float.Parse(Console.ReadLine());

            area = w*l;

        }

        else if (ch == 'c' || ch == 'C')

        {

            Console.WriteLine("\nYou choose \"Circle\" ");

            Console.Write("Input radius : ");

            r = float.Parse(Console.ReadLine());

            PI = 3.141f;

            area = PI*r*r;

        }   

            Console.WriteLine("==================================");

            Console.Write("Area = {0:n}\n",area);

            Console.WriteLine("==================================");

    }

}