using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OOP_Principles2
{
    class Shapes
    {
        public abstract class Shape
        {
            private double width;
            private double height;
            private double surface;

            public Shape(double width, double height)
            {
                this.width = width;
                this.height = height;

            }

            public double Width
            {
                get { return this.width; }

                private set
                {
                    if (value <= 0)
                    {
                        throw new ArgumentException("Width cant be less or equal of 0");
                    }
                    this.width = value;
                }


            }

            public double Height
            {
                get { return this.height; }
                private set{


                if(value <= 0)
            {
                throw new ArgumentException("Height cant be less or equal of 0");
            }
            this.height = value;
            }


            }

            public double Surface
            {
                get { return this.surface; }

                protected set
                {
                    this.surface = value;
                }
            }

        }
    }
}