using System;

public class Program

{

    public static void Main()

    {

        string line = "===========================";

        float area;

        Console.WriteLine(line);

        Console.WriteLine("{0,21}","Menu");

        Console.WriteLine(line );

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

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

        Console.WriteLine(line);

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

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

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

        {

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

            Console.Write("Input width :");

            int width = int.Parse(Console.ReadLine());

            Console.Write("Input lenght : ");

            int lenght = int.Parse(Console.ReadLine());

            area = width*lenght;

            Console.WriteLine(line);

            Console.WriteLine("Area = {0:f}",area);

            Console.WriteLine(line);

        }

        if (choice == 'c' || choice == 'C') //สูตรหาพื้น  = 3.14f*r*r;

        {

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

            Console.Write("Input radius : ");

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

            area =  3.141f * (radius * radius);

            Console.WriteLine(line);

            Console.WriteLine("Area = {0:f}",area);

            Console.WriteLine(line);

        }

    }

}