This example shows how you can code static and dynamic calls.
The example has three parts:
The following example shows how you would code static calls:
PROCESS NODYNAM NODLL
IDENTIFICATION DIVISION.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 RECORD-2 PIC X. (6)
01 RECORD-1. (2)
05 PAY PICTURE S9(5)V99.
05 HOURLY-RATE PICTURE S9V99.
05 HOURS PICTURE S99V9.
. . .
PROCEDURE DIVISION.
CALL "SUBPROG" USING RECORD-1. (1)
CALL "PAYMASTR" USING RECORD-1 RECORD-2. (5)
STOP RUN.
The following example shows how you would code dynamic calls:
DATA DIVISION.
WORKING-STORAGE SECTION.
77 PGM-NAME PICTURE X(8).
01 RECORD-2 PIC x. (6)
01 RECORD-1. (2)
05 PAY PICTURE S9(5)V99.
05 HOURLY-RATE PICTURE S9V99.
05 HOURS PICTURE S99V9.
. . .
PROCEDURE DIVISION.
. . .
MOVE "SUBPROG" TO PGM-NAME.
CALL PGM-NAME USING RECORD-1. (1)
CANCEL PGM-NAME.
MOVE "PAYMASTR" TO PGM-NAME. (4)
CALL PGM-NAME USING RECORD-1 RECORD-2. (5)
STOP RUN.
The following example shows a called subprogram that is called by each of the two preceding calling programs:
IDENTIFICATION DIVISION.
PROGRAM-ID. SUBPROG.
DATA DIVISION.
LINKAGE SECTION.
01 PAYREC. (2)
10 PAY PICTURE S9(5)V99.
10 HOURLY-RATE PICTURE S9V99.
10 HOURS PICTURE S99V9.
77 PAY-CODE PICTURE 9. (6)
PROCEDURE DIVISION USING PAYREC. (1)
. . .
EXIT PROGRAM. (3)
ENTRY "PAYMASTR" USING PAYREC PAY-CODE. (5)
. . .
GOBACK. (7)
In each of the CALL statements, the operand of the first USING option is identified as RECORD-1.
The PICTURE character-strings within PAYREC and PAY-CODE contain the same number of characters as RECORD-1 and RECORD-2, although the descriptions are not identical.
When control is transferred the second time from the statically linked program, SUBPROG is made available in its last-used state (that is, if any values in SUBPROG storage were changed during the first execution, those changed values are still in effect). When control is transferred from the dynamically linked program, however, SUBPROG is made available in its initial state, because of the CANCEL statement that has been executed.
In any given execution of the called program and either of the two calling programs, if the values within RECORD-1 are changed between the time of the first CALL and the second, the values passed at the time of the second CALL statement will be the changed, not the original, values. If you want to use the original values, you must save them.