The DEF statement lets you define a single- or multi-line function.

  Examples

  DEF DOUBLE Add (DOUBLE A,B, SINGLE C,D,E) = A+B+C+D+E
  DEF DOUBLE Example (DOUBLE A,B, SINGLE C,D,E)
  EXIT DEF IF B = 0
  Example = (A/B) + (C-D)^E
  END DEF