Natural distinguishes two types of subroutines: inline subroutines which are defined directly in the program and external subroutines which are stored as separate objects outside the program (this is explained later in this tutorial).

You will now add an inline subroutine to your program which moves an asterisk (*) to the new user-defined variable named #MARK. This subroutine will be invoked when an employee has 20 days of leave or more.

When you have completed the exercises below, your sample application will be structured as follows:

This document contains the following exercises:

• Defining the Inline Subroutine

• Performing the Inline Subroutine

---

Defining the Inline Subroutine

You will now add the subroutine to your program.

To define the subroutine

1. Insert the following below the user-defined variable #NAME-END:

   1 #MARK              (A1)

   This variable will be used by the subroutine. Therefore, it has to be defined first.

2. To define the subroutine, insert the following before the END statement:

   DEFINE SUBROUTINE MARK-SPECIAL-EMPLOYEES
     MOVE '*' TO #MARK
   END-SUBROUTINE

   When performed, this subroutine moves an asterisk (*) to #MARK.

   Note:
   Instead of using the statement MOVE '*' TO #MARK it is also possible to use the following variant of the ASSIGN or COMPUTE statement: #MARK := '*'.

3. Modify the DISPLAY statement as follows:

   DISPLAY NAME 3X DEPT 3X LEAVE-DUE 3X '>=20' #MARK

   This displays a new column in your output. Its heading is ">=20". The column will contain an asterisk (*) if the corresponding employee has 20 days of leave or more.

Performing the Inline Subroutine

Now that you have defined the inline subroutine, you can specify the corresponding code for performing it.

To perform the inline subroutine

1. Insert the following before the DISPLAY statement:

   IF LEAVE-DUE >= 20 THEN
     PERFORM MARK-SPECIAL-EMPLOYEES
   ELSE
     RESET #MARK
   END-IF

   When an employee is found who has 20 days of leave or more, the new subroutine named MARK-SPECIAL-EMPLOYEES is performed. When an employee has less than 20 days of leave, the content of #MARK is reset to blank.

   Your program should now look as follows:

   DEFINE DATA
   LOCAL
     1 #NAME-START        (A20)
     1 #NAME-END          (A20)
     1 #MARK              (A1)
     1 EMPLOYEES-VIEW VIEW OF EMPLOYEES
       2 FULL-NAME
         3 NAME (A20)
       2 DEPT (A6)
       2 LEAVE-DATA
         3 LEAVE-DUE (N2)
   END-DEFINE
   *
   RP1. REPEAT
   *
     INPUT USING MAP 'MAP01'
   *
     IF #NAME-START = '.' THEN
       ESCAPE BOTTOM (RP1.)
     END-IF
   *
     IF #NAME-END = ' ' THEN
       MOVE #NAME-START TO #NAME-END
     END-IF
   *
     RD1. READ EMPLOYEES-VIEW BY NAME
       STARTING FROM #NAME-START
       ENDING AT #NAME-END
   *    
       IF LEAVE-DUE >= 20 THEN
         PERFORM MARK-SPECIAL-EMPLOYEES
       ELSE
         RESET #MARK
       END-IF
   *
       DISPLAY NAME 3X DEPT 3X LEAVE-DUE 3X '>=20' #MARK
   *
     END-READ
   *
     IF *COUNTER (RD1.) = 0 THEN
       REINPUT 'No employees meet your criteria.'
     END-IF
   *
   END-REPEAT
   *
   DEFINE SUBROUTINE MARK-SPECIAL-EMPLOYEES
     MOVE '*' TO #MARK
   END-SUBROUTINE
   *
   END

2. Run the program.

3. In the resulting map, enter "JONES" and press ENTER.

   The list of employees should now contain the additional column.

4. To return to the program editor, enter EDIT at the MORE prompt.

5. Stow the program.

You can now proceed with the next exercises: Processing Rules and Helproutines.