C#

private int myValue;

public MyClassOrStruct(int myValue)
{
    this.myValue = myValue;
}

public int MyValue
{
    get { return myValue; }
}

public int Square
{
    get { return myValue * myValue; }
}

using System;
using System.Drawing;

namespace ShapesLibrary
{
    // Immutable struct
    public struct Triangle
    {
        public static readonly Triangle Empty = new Triangle();

        private Point anchor;
        private float angle;
        private int radius;

        public Triangle(Point anchor, Int32 radius, float angle)
        {
            this.anchor = anchor;
            this.angle = angle;
            this.radius = radius;
            // check values for validity and throw ArgumentOutOfRangeException if necessary
        }

        public Point Anchor
        {
            get { return anchor; }
        }
        public float Angle
        {
            get { return angle; }
        }
        public float Radius
        {
            get { return radius; }
        }
        public Point Vertex1
        {
            get
            {
                return new Point(
                    (int)(radius * Math.Cos(angle)),
                    (int)(radius * Math.Sin(angle)));
            }
        }
        public Point Vertex2
        {
            get
            {
                return new Point(
                    (int)(radius * Math.Cos(angle + 120)),
                    (int)(radius * Math.Sin(angle + 120)));
            }
        }
        public Point Vertex3
        {
            get
            {
                return new Point(
                    (int)(radius * Math.Cos(angle + 240)),
                    (int)(radius * Math.Sin(angle + 240)));
            }
        }
    }
}

DaveyM69 wrote:

// Immutable struct
public struct Triangle

OriginalGriff wrote:

triangle rotated through any angle is technically a new triangle

Rob Philpott wrote:

Values *do* change

int x = 2;
x = 3;

PROGRAM ARRGH

WRITE(*,*) "Seventeen = ", 17
OMG(17)
WRITE(*,*) "Seventeen = ", 17

CONTAINS

SUBROUTINE OMG(INT I)
I = I + 7
RETURN
END SUBROUTINE OMG

END PROGRAM ARRGH

Seventeen = 17
Seventeen = 24

public void Draw(PointF offset, float rotationAngle)
{ // ... }