/* C#: The Complete Reference by Herbert Schildt Publisher: Osborne/McGraw-Hill (March 8, 2002) ISBN: 0072134852 */ // An example of operator overloading. using System; // A three-dimensional coordinate class. class ThreeD { int x, y, z; // 3-D coordinates public ThreeD() { x = y = z = 0; } public ThreeD(int i, int j, int k) { x = i; y = j; z = k; } // Overload binary +. public static ThreeD operator +(ThreeD op1, ThreeD op2) { ThreeD result = new ThreeD(); /* This adds together the coordinates of the two points and returns the result. */ result.x = op1.x + op2.x; // These are integer additions result.y = op1.y + op2.y; // and the + retains its original result.z = op1.z + op2.z; // meaning relative to them. return result; } // Overload binary -. public static ThreeD operator -(ThreeD op1, ThreeD op2) { ThreeD result = new ThreeD(); /* Notice the order of the operands. op1 is the left operand and op2 is the right. */ result.x = op1.x - op2.x; // these are integer subtractions result.y = op1.y - op2.y; result.z = op1.z - op2.z; return result; } // Show X, Y, Z coordinates. public void show() { Console.WriteLine(x + ", " + y + ", " + z); } } public class ThreeDDemo { public static void Main() { ThreeD a = new ThreeD(1, 2, 3); ThreeD b = new ThreeD(10, 10, 10); ThreeD c = new ThreeD(); Console.Write("Here is a: "); a.show(); Console.WriteLine(); Console.Write("Here is b: "); b.show(); Console.WriteLine(); c = a + b; // add a and b together Console.Write("Result of a + b: "); c.show(); Console.WriteLine(); c = a + b + c; // add a, b and c together Console.Write("Result of a + b + c: "); c.show(); Console.WriteLine(); c = c - a; // subtract a Console.Write("Result of c - a: "); c.show(); Console.WriteLine(); c = c - b; // subtract b Console.Write("Result of c - b: "); c.show(); Console.WriteLine(); } }