*> FizzBuzz 1..20 —— 循环（PERFORM VARYING）+ 判别（IF / 取余）的组合。
      *> 运行： vml run examples/cobol/demo/fizzbuzz.cob
       IDENTIFICATION DIVISION.
       PROGRAM-ID. FIZZBUZZ.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01 I   PIC 9(3) VALUE 0.
       01 R3  PIC 9(3) VALUE 0.
       01 R5  PIC 9(3) VALUE 0.
       PROCEDURE DIVISION.
       MAIN-PARA.
           PERFORM SHOW-ONE VARYING I FROM 1 BY 1 UNTIL I > 20.
           STOP RUN.
       SHOW-ONE.
           COMPUTE R3 = I - (I / 3) * 3.
           COMPUTE R5 = I - (I / 5) * 5.
           IF R3 = 0 AND R5 = 0 THEN
               DISPLAY "FIZZBUZZ"
           ELSE
               IF R3 = 0 THEN
                   DISPLAY "FIZZ"
               ELSE
                   IF R5 = 0 THEN
                       DISPLAY "BUZZ"
                   ELSE
                       DISPLAY I
                   END-IF
               END-IF
           END-IF.