RESET

RESET  [INITIAL]  operand1

This document covers the following topics:

For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.

Related Statements: ADD | COMPRESS | COMPUTE | DIVIDE | EXAMINE | MOVE | MOVE ALL | MULTIPLY | SEPARATE | SUBTRACT

Belongs to Function Group: Arithmetic and Data Movement Operations

RESET Usage

The RESET statement is used to reset the value of a field:

  • RESET (without INITIAL) sets the content of each specified field to its default initial value depending on its format.

  • RESET INITIAL sets each specified field to the initial value as defined for the field in the DEFINE DATA statement. For a field declared without INIT clause in the DEFINE DATA statement, RESET INITIAL has the same effect as RESET (without INITIAL).

Notes:

  1. A field declared with a CONSTANT clause in the DEFINE DATA statement may not be referenced in a RESET statement, since its content cannot be changed.
  2. In reporting mode, the RESET statement may also be used to define a variable, provided that the program contains no DEFINE DATA LOCAL statement.

RESET Syntax Description

Operand Definition Table:

Operand Possible Structure Possible Formats Referencing Permitted Dynamic Definition
operand1   S A G M A U N P I F B D T L C G O yes yes

Syntax Element Description:

Syntax Element Description
RESET operand1
Reset to Null Value:

RESET (without INITIAL) sets the content of each specified field (operand1) to its default initial value.

If operand1 is a dynamic variable, it will be reset to a null value with the length the variable currently has at the time the RESET statement is executed. The current length of a dynamic variable can be ascertained by using the system variable *LENGTH.

For general information on dynamic variables, see the section Using Dynamic and Large Variables.

RESET INITIAL operand1
Reset to Initial Value:

RESET INITIAL sets each specified field (operand1) to the initial value as defined for the field in the DEFINE DATA statement.

  • If you specify no INIT value in the DEFINE DATA statement, a field will be initialized with a default initial value depending on its format.

  • If a dynamic variable is used, *LENGTH is set to zero if no initial value is defined.

  • If you apply RESET INITIAL to an array, it must be applied to the entire array (as defined in the DEFINE DATA statement); a RESET INITIAL of individual array occurrences is not possible.

  • If an X-array is used, *OCCURRENCE is set to zero.

  • RESET INITIAL of fields resulting from a redefinition is not possible either.

  • RESET INITIAL is applied to a dynamic variable.

  • RESET INITIAL cannot be applied to database fields.

RESET Example

** Example 'RSTEX1': RESET (with/without INITIAL)                       
************************************************************************
DEFINE DATA LOCAL                                                       
1 EMPLOY-VIEW VIEW OF EMPLOYEES                                         
  2 NAME                                                                
1 #BINARY  (B4) INIT <1>                                           
1 #INTEGER (I4) INIT <5>                                          
1 #NUMERIC (N2) INIT <25>                                          
END-DEFINE                                                              
*                                                                       
LIMIT 1                                                                 
READ EMPLOY-VIEW                                                        
  /*                                                                    
  WRITE NOTITLE 'VALUES BEFORE RESET STATEMENT:'                        
  WRITE / '=' NAME '=' #BINARY '=' #INTEGER '=' #NUMERIC                
  /*                                                                    
  RESET NAME #BINARY #INTEGER #NUMERIC                               
  /*                                                                    
  WRITE /// 'VALUES AFTER  RESET STATEMENT:'                            
  WRITE / '=' NAME '=' #BINARY '=' #INTEGER '=' #NUMERIC                
  /*                                                    
  RESET INITIAL #BINARY #INTEGER #NUMERIC           
  /*                                                    
  WRITE /// 'VALUES AFTER  RESET INITIAL STATEMENT:'    
  WRITE / '=' NAME '=' #BINARY '=' #INTEGER '=' #NUMERIC
  /*                                                    
END-READ                                                
END

Output of Program RSTEX1:

VALUES BEFORE RESET STATEMENT:                                              
                                                                            
NAME: ADAM                 #BINARY: 00000001 #INTEGER:           5 #NUMERIC:
 25                                                                         
                                                                            
                                                                            
                                                                            
VALUES AFTER  RESET STATEMENT:                                              
                                                                            
NAME:                      #BINARY: 00000000 #INTEGER:           0 #NUMERIC:
  0                                                                         
                                                                            
                                                                            
                                                                            
VALUES AFTER  RESET INITIAL STATEMENT:                                      
                                                                            
NAME:                      #BINARY: 00000001 #INTEGER:           5 #NUMERIC:
 25