Shape.cs

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

namespace SkillMineProject7.DynamicAndExplicit
{
    abstract public class Shape
    {
        public abstract void CalculateArea();
        public class Circle : Shape
        {
            private int r;
            private double area;
            public Circle(int r)
            {
                this.r = r;
            }

            public override void CalculateArea()
            {
                area = 3.14 * r * r;
            }
            public override string ToString()
            {
                return $"area of circle is {area}";
            }
        }
        public class Rectangle : Shape
        {
            private int l, w;
            private double arearectangle;

            public Rectangle(int l, int w) : base()
            {
                this.l = l;
                this.w = w;

            }
            public override void CalculateArea()
            {
                arearectangle = l * w;
            }
            public override string ToString()
            {
                return $"Rectangle Area{arearectangle}";
            }
        }
    }
}