using System;

public class Program

{

    public static void Main()

    {

        bool run=true;

        double l=0;

        double w=0;

        Console.WriteLine("enter length");

        do

        {

        if (int.TryParse(Console.ReadLine(), out int num))

            {

            run = false;

            l=num;

            }

        else

            {

         Console.WriteLine("please input a number");

            }

​

        } while (run);

        Console.WriteLine("enter width");

        run=true;

        do

        {

        if (int.TryParse(Console.ReadLine(), out int num))

            {

            run = false;

            w=num;

            }

        else

            {

         Console.WriteLine("please input a number");

            }

​

        } while (run);

        AreaandPerimter(l, w, out double area, out double perimeter);

        Console.WriteLine($"area = {area} and perimter = {perimeter}");

    }

    public static void greetU(String name){

        Console.WriteLine("What's poppin "+name+"?");

    }

    public static void AreaandPerimter(double l, double w, out double area, out double perimeter){

        area=l*w;

        perimeter=l+l+w+w;

    }

}

​