Answer / Parit Agarwal

Here's a simple example of an RPG program that calculates and displays the marks of five students in three subjects:

01 PROC PGM
02 DCL VAR(STUDENT_REC) TYPE(A) DIMENSION(5)
03 DCL VAR(SUBJECT_CODE) CHAR(3) VALUE('ENG')
04 DCL VAR(MARKS(15)) SSIZE(15)
05 DCL VAR(TOTAL_ENG) SSIZE(8) Zeros
06 DCL VAR(AVG_ENG) SSIZE(8) Zeros
07
08 PERFORM calculation-eng FOR E FROM 1 THRU 5
09
10 PROCEDURE calculation-eng
11 ADDRESS STUDENT_REC(E)
12 SETVAL SUBJECT_CODE TO 'ENG'
13
14 PERFORM GET-MARKS FOR A FROM 1 THRU 3
15
16 PROCEDURE GET-MARKS
17 ADDRESS STUDENT_REC(A)
18 SETVAL MARKS(A) TO INPUT('Enter mark for subject ' SUBJECT_CODE : A:1 CHAR FORMAT(9.2))
19 IF (SUBSTR(SUBJECT_CODE, 2, 1) = '2') THEN
20 ADD TOTAL_ENG(A) TO MARKS(A)
21 ENDIF
22
23 ENDPROC GET-MARKS
24
25 PERFORM calculation-math FOR E FROM 1 THRU 5 AFTER CALCULATION-ENG
26
27 PROCEDURE calculation-math
28 ADDRESS STUDENT_REC(E)
29 SETVAL SUBJECT_CODE TO 'MATH'
30
31 PERFORM GET-MARKS FOR A FROM 1 THRU 3
32
33 ENDPROC CALCULATION-MATH
34
35 PERFORM calculation-sci FOR E FROM 1 THRU 5 AFTER CALCULATION-MATH
36
37 PROCEDURE calculation-sci
38 ADDRESS STUDENT_REC(E)
39 SETVAL SUBJECT_CODE TO 'SCI'
40
41 PERFORM GET-MARKS FOR A FROM 1 THRU 3
42
43 ENDPROC CALCULATION-SCI
44
45 IF (SUBSTR(SUBJECT_CODE, 2, 1) = 'E') THEN
46 ADD TOTAL_ENG(E) TO AVG_ENG
47 ENDIF
48
49 DISPLAY 'Student A' : SUBSTR(STUDENT_REC(1), 2, 15) : 'English: ' MARKS(1) : 'Math: ' MARKS(2) : 'Science: ' MARKS(3) :
50
51 IF (SUBSTR(STUDENT_REC(1), 2, 15) = 'Student E') THEN
52 DISPLAY 'Total English for student E: ' AVG_ENG :
53 DISPLAY 'Average for students: ' ((AVG_ENG DIV 5) FORMAT(9.2))
54 ENDIF
55
56 ENDPROC PGM

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