public static void Main()
Console.WriteLine("enter length");
if (int.TryParse(Console.ReadLine(), out int num))
Console.WriteLine("please input a number");
Console.WriteLine("enter width");
if (int.TryParse(Console.ReadLine(), out int num))
Console.WriteLine("please input a number");
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){