Here is an example of an operator definition:
The operator computes the real average of two integers.

~ ~ ~ ~ ~ double average (int x,  int y) { int sum = x + y; double ave = sum / 2.0; return ave; }

 

This example shows how we use operators and ``pass'' the parameters:

Read two real numbers.   Interpret the first as the radius of a circle and the second as the side of a square.   Display the average value of the areas of the corresponding circle and square.  class AverageCS  { static public void main (~ ~ ~ ~ ~) { double r = IO.read_double (); double s = IO.read_double (); double acs = averageCS (r,  s); IO.println (``The average area is'' + acs + ``square units.''); }  static public double averageCS (double radius,  double side) { Circle c = new Circle (radius); Square s = new Square (side); double ave = (c.area () + s.area ()) / 2.0; return ave; } }

 

Here is an example of a command definition:
The command takes one integer and displays both the predecessor and the successor.

~ ~ ~ ~ ~ void printPS (int x) { IO.println (x - 1); IO.println (x + 1); }