docs/csharp/fundamentals/tutorials/snippets/inheritance/shape.cs - main - aprogrammer/dotnet-docs

docs/csharp/fundamentals/tutorials/snippets/inheritance/shape.cs
116 строк3 KB
Bill Wagner
Update tutorials to .NET 6 (#28404)
28 фев 2022, 21:50
28 фев 2022, 21:500e4df77
// <Snippet1>
public abstract class Shape
{
    public abstract double Area { get; }

    public abstract double Perimeter { get; }

    public override string ToString() => GetType().Name;

    public static double GetArea(Shape shape) => shape.Area;

    public static double GetPerimeter(Shape shape) => shape.Perimeter;
}
// </Snippet1>

namespace DerivedClasses
{
    // <Snippet2>
    using System;

    public class Square : Shape
    {
        public Square(double length)
        {
            Side = length;
        }

        public double Side { get; }

        public override double Area => Math.Pow(Side, 2);

        public override double Perimeter => Side * 4;

        public double Diagonal => Math.Round(Math.Sqrt(2) * Side, 2);
    }

    public class Rectangle : Shape
    {
        public Rectangle(double length, double width)
        {
            Length = length;
            Width = width;
        }

        public double Length { get; }

        public double Width { get; }

        public override double Area => Length * Width;

        public override double Perimeter => 2 * Length + 2 * Width;

        public bool IsSquare() => Length == Width;

        public double Diagonal => Math.Round(Math.Sqrt(Math.Pow(Length, 2) + Math.Pow(Width, 2)), 2);
    }

    public class Circle : Shape
    {
        public Circle(double radius)
        {
            Radius = radius;
        }

        public override double Area => Math.Round(Math.PI * Math.Pow(Radius, 2), 2);

        public override double Perimeter => Math.Round(Math.PI * 2 * Radius, 2);

        // Define a circumference, since it's the more familiar term.
        public double Circumference => Perimeter;

        public double Radius { get; }

        public double Diameter => Radius * 2;
    }
    // </Snippet2>
} // Namespace definition

namespace Example
{

    using DerivedClasses;
    // <Snippet3>
    using System;

    public class Example
    {
        public static void Main()
        {
            Shape[] shapes = { new Rectangle(10, 12), new Square(5),
                        new Circle(3) };
            foreach (Shape shape in shapes)
            {
                Console.WriteLine($"{shape}: area, {Shape.GetArea(shape)}; " +
                                  $"perimeter, {Shape.GetPerimeter(shape)}");
                if (shape is Rectangle rect)
                {
                    Console.WriteLine($"   Is Square: {rect.IsSquare()}, Diagonal: {rect.Diagonal}");
                    continue;
                }
                if (shape is Square sq)
                {
                    Console.WriteLine($"   Diagonal: {sq.Diagonal}");
                    continue;
                }
            }
        }
    }
    // The example displays the following output:
    //         Rectangle: area, 120; perimeter, 44
    //            Is Square: False, Diagonal: 15.62
    //         Square: area, 25; perimeter, 20
    //            Diagonal: 7.07
    //         Circle: area, 28.27; perimeter, 18.85
    // </Snippet3>
} // Namespace definition.