Answer to Question #163145 in C# for rittu

Question

Define an abstract class Shape with abstract method CalculateSurface () and fields width and height. Define two additional classes for a triangle and a rectangle, which implement CalculateSurface (). This method has to return the areas of the rectangle (height*width) and the triangle (height*width/2). Define a class for a circle with an appropriate constructor, which initializes the two fields (height and width) with the same value (the radius) and implement the abstract method for calculating the area. Create an array of different shapes and calculate the area of each shape in another array

Answer 1

class Program
    {
        static void Main(string[] args)
        {
            Shape[] shapes = new Shape[6]; // Creating an array of shapes
            shapes[0] = new Rectangle(5, 10); // Initalizing an array
            shapes[1] = new Triangle(15, 20);
            shapes[2] = new Circle(16);
            shapes[3] = new Rectangle(30, 40);
            shapes[4] = new Triangle(10, 5);
            shapes[5] = new Circle(6);


            double[] areas = new double[6]; // Creating an array for areas of each shape


            for(int i = 0; i < shapes.Length; i++)
            {
                areas[i] = shapes[i].CalculateSurface();
            }


            for (int i = 0; i < shapes.Length; i++) // Output areas
            {
                Console.WriteLine($"Area: {areas[i]}");
            }


            Console.ReadKey();
        }
    }
    public abstract class Shape
    {
        protected double width;
        protected double height;


        public Shape(double Width)
        {
            width = height = Width;
        }
        public Shape(double Width, double Height)
        {
            width = Width;
            height = Height;
        }
        public abstract double CalculateSurface();
    }


    public class Triangle : Shape
    {
        public Triangle(double Width, double Height) : base(Width, Height)
        {


        }
        public override double CalculateSurface()
        {
            return height * width / 2;
        }
    }


    public class Rectangle : Shape
    {
        public Rectangle(double Width, double Height) : base(Width, Height)
        {


        }
        public override double CalculateSurface()
        {
            return height * width;
        }
    }


    public class Circle : Shape
    {
        public Circle(double Radius) : base(Radius)
        {   


        }
        public override double CalculateSurface()
        {
            return Math.PI * Math.Pow(width, 2);
        }
    }