Quelle  complex.cob   Sprache: Cobol

      *   Complex Numbers in COBOL
      *   What a curiosity
         IDENTIFICATION DIVISION.
         CLASS-ID. "Complex"  Inherits SOMObject.
         ENVIRONMENT DIVISION.
         Configuration Section.
         Repository.
         CLASS SOMObject IS "SOMObject"
         CLASS UserInterface IS "UserInt" .
         DATA DIVISION.
         Working-Storage Section.
         01 Number.
           05 Real    pic s9(4)V9(4).
           05 Image   pic s9(4)V9(4).
         PROCEDURE DIVISION.
         
         IDENTIFICATION DIVISION.
         METHOD-ID. "Add" .
         DATA DIVISION.
         Working-Storage Section.
         Linkage Section.
         01 Res.
           05 Real  pic s9(4)V9(4).
           05 Image pic s9(4)V9(4).
         01 Number1.
           05 Real  pic s9(4)V9(4).
           05 Image pic s9(4)V9(4).
         01 Number2.
           05 Real  pic s9(4)V9(4).
           05 Image pic s9(4)V9(4).
         PROCEDURE DIVISION Using Number1, Number2, res.
           add Real  of Number1 Real  of Number2 giving real  of Res.
           add Image of Number1 Image of Number2 giving Image of Res.
         END METHOD "Add" .
         
         
         IDENTIFICATION DIVISION.
         METHOD-ID. "Multiply" .
         DATA DIVISION.
         Linkage Section.
         01 Res.
           05 Real  pic s9(4)V9(4).
           05 Image pic s9(4)V9(4).
         01 Number1.
           05 Real  pic s9(4)V9(4).
           05 Image pic s9(4)V9(4).
         01 Number2.
           05 Real  pic s9(4)V9(4).
           05 Image pic s9(4)V9(4).
         PROCEDURE DIVISION Using Number1, Number2, Res.
           compute Real  of Res = Real of Number1 * Real  of Number2 
                                - Image of Number1 * Image of Number2.
           compute Image of Res = Real of Number1 * Image  of Number2
                                + Image of Number1 * Real of Number2.
         END METHOD "Multiply".
         END CLASS "Complex" .