using System;

public class Program {

    public static class Klass {

        public struct Vector {

            public static readonly Vector Zero = new Vector(0, 0);

​

            public int X;

            public int Y;

​

            public Vector(int x, int y) {

                X = x;

                Y = y;

            }

​

            public Vector(in Vector vec) {

                X = vec.X;

                Y = vec.Y;

            }

​

            public override string ToString() => $"{{{X}, {Y}}}";

        }

        public struct Bound {

            public static readonly Bound Zero = new Bound(Vector.Zero, Vector.Zero);

​

            public Vector Offset;

            public Vector Extent;

​

            public Bound(in Vector offset, in Vector extent) {

                Offset = offset;

                Extent = extent;

            }

​

            public override string ToString() => $"[{Offset}, {Extent}]";

        }

    }

    public static class Strukt {

        public sealed class Vector {

            public static readonly Vector Zero = new Vector(0, 0);

​

            public int X;

            public int Y;

​

            public Vector(int x, int y) {

                X = x;

                Y = y;

            }

​

            public Vector(Vector vec) {

                X = vec.X;

                Y = vec.Y;

            }

​

            public override string ToString() => $"{{{X}, {Y}}}";

        }

        public sealed class Bound {

            public static readonly Bound Zero = new Bound(Vector.Zero, Vector.Zero);

​

            public Vector Offset;

            public Vector Extent;

​

            public Bound(Vector offset, Vector extent) {

                Offset = new Vector(offset);

                Extent = new Vector(extent);

            }

​

            public override string ToString() => $"[{Offset}, {Extent}]";

        }

    }

    public static void Main() {

        Klass.Bound referenceBound = Klass.Bound.Zero;

        Strukt.Bound testBound = Strukt.Bound.Zero;

​

        void DumpBound() {

            bool equivalent = 

                testBound.Offset.X == referenceBound.Offset.X &&

                testBound.Offset.Y == referenceBound.Offset.Y &&

                testBound.Extent.X == referenceBound.Extent.X &&

                testBound.Extent.Y == referenceBound.Extent.Y;

            if (equivalent) {

                Console.WriteLine($"       {testBound} = {referenceBound}       ");

            }

            else {

                Console.WriteLine($"!!!!!! {testBound} ≠ {referenceBound} !!!!!!");

            }

        }

        DumpBound();

        referenceBound.Offset = new Klass.Vector(1, 0); 

        testBound.Offset = new Strukt.Vector(1, 0);

        DumpBound();

        referenceBound.Extent.X += 2;

        testBound.Extent.X += 2;

        DumpBound();

        referenceBound.Extent.X = 3;

        testBound.Extent.X = 3;

        DumpBound();

    }

}