using System;  

public class Program  

{  

    public static void Main()

{

      int choice,r,l,w,s,b,h;

      double area;

        Console.WriteLine("Selection (Using SWITCH-CASE) - Activity #2");

        Console.WriteLine("Programmed by: Escalante, Kristine Mae ‖ EIT 0121.1-3 " );

        Console.WriteLine(" ");

        Console.WriteLine("   ");

        Console.WriteLine("(っ◔◡◔)っ ♥ 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝗶𝗰 𝗦𝗵𝗮𝗽𝗲𝘀 𝗔𝗿𝗲𝗮 𝗖𝗮𝗹𝗰𝘂𝗹𝗮𝘁𝗼𝗿 (っ◔◡◔)っ ♥  ");

        Console.WriteLine("   ");

        Console.Write("Select 1 for Area of Circle\n");

        Console.Write("Select 2 for Area of Rectangle\n");

        Console.Write("Select 3 for Area of Square\n");

        Console.Write("Select 4 for Area of Triangle\n");

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

​

      switch(choice){

           case 1: // Area of Circle

                 Console.Write("Input the radius of the circle: ");

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

                 area=3.1416*r*r; //Formula 1: Cirlce

                 Console.WriteLine("𝙏𝙝𝙚 𝙖𝙧𝙚𝙖 𝙤𝙛 𝙘𝙞𝙧𝙘𝙡𝙚 𝙞𝙨 " + area + " 𝙨𝙦𝙪𝙖𝙧𝙚 𝙪𝙣𝙞𝙩𝙨.");

                 break;

            case 2: // Area of Rectangle

                  Console.Write("Input the length  of the rectangle: ");

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

                  Console.Write("Input the width of the rectangle: ");

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

                  area=l*w; //Formula 2: Rectangle

                  Console.WriteLine("𝙏𝙝𝙚 𝙖𝙧𝙚𝙖 𝙤𝙛 𝙧𝙚𝙘𝙩𝙖𝙣𝙜𝙡𝙚 𝙞𝙨 " + area + " 𝙨𝙦𝙪𝙖𝙧𝙚 𝙪𝙣𝙞𝙩𝙨.");

                  break;

            case 3: // Area of Square

                  Console.Write("Input the side of square: ");

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

                  area= s*s; // Formula 3: Square

                  Console.WriteLine("𝙏𝙝𝙚 𝙖𝙧𝙚𝙖 𝙤𝙛 𝙨𝙦𝙪𝙖𝙧𝙚 𝙞𝙨 " + area + " 𝙨𝙦𝙪𝙖𝙧𝙚 𝙪𝙣𝙞𝙩𝙨.");

                  break;

            case 4: // Area of Triangle

                  Console.Write("Input the base of the triangle:");

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

                  Console.Write("Input the height of the triangle:");

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

                  area= 0.5*b*h; // Formula 4: Triangle

                  Console.WriteLine("𝙏𝙝𝙚 𝙖𝙧𝙚𝙖 𝙤𝙛 𝙩𝙧𝙞𝙖𝙣𝙜𝙡𝙚 𝙞𝙨 " + area + " 𝙨𝙦𝙪𝙖𝙧𝙚 𝙪𝙣𝙞𝙩𝙨.");

                  break;

            default: // Incorrect Input

                  Console.Write("〒_〒 𝗘𝗥𝗥𝗢𝗥!!! 𝗚𝗼 𝗯𝗮𝗰𝗸 𝘁𝗼 𝘁𝗵𝗲 𝗶𝗻𝘀𝘁𝗿𝘂𝗰𝘁𝗶𝗼𝗻𝘀 𝗮𝗻𝗱 𝗿𝗲𝗮𝗱 𝗶𝘁 𝗰𝗮𝗿𝗲𝗳𝘂𝗹𝗹𝘆!! 〒_〒 ");

                  break;

    }

}

    }