Structured Mode Syntax

CALL LOOP   operand1   [operand2] ...40

statement

END-LOOP

Reporting Mode Syntax

CALL LOOP  operand1  [operand2] ...40

statement

LOOP

This document covers the following topics:

• CALL LOOP Usage

• CALL LOOP Restrictions

• CALL LOOP Syntax Description

• CALL LOOP Example

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

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CALL LOOP Usage

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.

CALL LOOP Restrictions

The statements AT BREAK, AT START OF DATA and AT END OF DATA must not be used within a CALL LOOP processing loop.

CALL LOOP Syntax Description

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: In structured mode, the Natural reserved word END-LOOP must be used to end the CALL LOOP statement. In reporting mode, the Natural statement LOOP is used to end the CALL LOOP statement.
LOOP

CALL LOOP Example

DEFINE DATA LOCAL
1 PARAMETER1 (A10)
END-DEFINE
CALL LOOP 'ABC' PARAMETER1
  IF PARAMETER1 = 'END'
     ESCAPE BOTTOM
  END-IF
END-LOOP
END