using System;

​

   public interface Geo {

   double perimetru();

   double arie();

       string nume{get;}

}

public class cerc : Geo{

   double raza;string forma = "cerc";

    public string nume

    {

        get{return nume;}

    }

   public cerc(double x){

       raza=x;

   }

   public double perimetru(){

       return 2*raza*System.Math.PI;

   }

   public double arie(){

       return System.Math.PI * raza * raza;

   }

}

public class patrat : Geo{

   double l;string forma = "patrat";

    public string nume

    {

        get{return nume;}

    }

   public patrat(double x){

       l=x;

   }

   public double perimetru(){

       return 4*l;

   }

   public double arie(){

       return l*l;

   }

}

​

  public class Program

   {

       static void print(Geo I){

           Console.WriteLine("{0}:",I.nume);

           Console.WriteLine("{0}:#.##}:",I.perimetru());

           Console.WriteLine("{0:#.##}:",I.arie());

       }

       static void Main(string[] args)

       {

          /* patrat abcd = new patrat(5);

           cerc o = new cerc(3);

           string pp  =  String.Format("{0:.##}", abcd.perimetru());

           string ap =  String.Format("{0:.##}", abcd.arie());

           string pc  =  String.Format("{0:.##}", o.perimetru());

           string ac  =  String.Format("{0:.##}", o.arie());

           Console.WriteLine(pp);

           Console.WriteLine(ap);

           Console.WriteLine(pc);

           Console.WriteLine(ac); */

          bool ok = true;

           while (ok)

           {

            Console.WriteLine("Alegeti cifra potrivita optiunii dorite: ");

            Console.WriteLine("1.Patrat");

            Console.WriteLine("2.Cerc");

            Console.WriteLine("0.Iesire");

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

               if(c==0) ok=false ;

               else if(c==1)

               {

                Console.WriteLine("Latura?");

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

                   patrat abcd = new patrat(l);

                   print(abcd);

                   Console.WriteLine("Apasati enter pentru a continua");

                   string s = Console.ReadLine();

               }

               else if (c==2)

               {

                    Console.WriteLine("Raza?");

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

                   cerc o = new cerc(l);

                   print(o);

                   Console.WriteLine("Apasati enter pentru a continua");

                   string s = Console.ReadLine();

               }

           }

       }

   }

​

​