CALL
LOOP operand1 [operand2]
...40 |
statement
 |
END-LOOP |
CALL LOOP
operand1
[operand2]
...40 |
| statement
|
[LOOP]
|
This document covers the following topics:
For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.
Related Statements: CALL | CALL FILE |
CALLNAT |
DEFINE SUBROUTINE |
ESCAPE |
FETCH |
PERFORM
Belongs to Function Group: Invoking Programs and Routines
The CALL LOOP statement is used to generate a processing
loop that contains a call to a non-Natural program.
Unlike the CALL
statement, the CALL LOOP statement results in a processing loop
which is used to repeatedly call the non-Natural program. See the
CALL statement for a detailed
description of the CALL processing.
The statements AT
BREAK, AT START OF
DATA and AT END OF
DATA must not be used within a CALL LOOP
processing loop.
Operand Definition Table:
| Operand | Possible Structure | Possible Formats | Referencing Permitted | Dynamic Definition | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
operand1 |
C | S | A | yes | no | |||||||||||||||
operand2 |
C | S | A | G | A | U | N | P | I | F | B | D | T | L | C | yes | yes | |||
Syntax Element Description:
| Syntax Element | Description |
|---|---|
operand1 |
Program to be Called: The name of the non-Natural program to be called
can be specified as a constant or - if different programs are to be called
dependent on program logic - as an alphanumeric variable of length 1 to 8. A
program name must be placed left-justified in the variable.
|
operand2 |
Parameters: The CALL LOOP statement can have a
maximum of 40 parameters. The parameter list is constructed as described for
the CALL statement. Fields
used in the parameter list may be initially defined in the CALL
LOOP statement itself or may have been previously defined.
|
statement
... |
Processing Loop: The CALL LOOP statement initiates a processing loop
which must be terminated with an ESCAPE statement.
|
END-LOOP |
End of CALL LOOP Statement: The Natural reserved word END-LOOP must be used to close the
processing loop.
|
DEFINE DATA LOCAL
1 PARAMETER1 (A10)
END-DEFINE
CALL LOOP 'ABC' PARAMETER1
IF PARAMETER1 = 'END'
ESCAPE BOTTOM
END-IF
END-LOOP
END