DECIDE FOR

DECIDE FOR

FIRST

CONDITION
EVERY
  {WHEN   logical-condition   statement }   
  [WHEN ANY   statement ]
  [WHEN ALL   statement ]
  WHEN NONE   statement
END-DECIDE

This document covers the following topics:

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

Related Statements: DECIDE ON | IF | IF SELECTION | ON ERROR

Belongs to Function Group: Processing of Logical Conditions

Function

The DECIDE FOR statement is used to decide for one or more actions depending on multiple conditions (cases).

Note:
If no action is to be performed under a certain condition, you must specify the statement IGNORE in the corresponding clause of the DECIDE FOR statement.

Syntax Description

Syntax Element Description
FIRST CONDITION
Processing of First Condition Only:

Only the first true condition is to be processed.

See also Example 1.

EVERY CONDITION
Processing of Every Condition:

Every true condition is to be processed.

See also Example 2.

WHEN logical-condition statement
Logical Condition(s) to be Processed:

With this clause, you specify the logical condition(s) to be processed.

See the section Logical Condition Criteria in the Programming Guide.

WHEN ANY statement
WHEN ANY Clause:

With WHEN ANY, you can specify the statement(s) to be executed when any of the logical conditions are true.

WHEN ALL statement
WHEN ALL Clause:

With WHEN ALL, you can specify the statement (s) to be executed when all logical conditions are true.

This clause is applicable only if EVERY has been specified.

WHEN NONE statement
WHEN NONE Clause:

With WHEN NONE, you specify the statement(s) to be executed when none of the logical conditions are true.

END-DECIDE
End of DECIDE FOR Statement:

The Natural reserved word END-DECIDE must be used to end the DECIDE FOR statement.

Examples

Example 1 - DECIDE FOR with FIRST Option

** Example 'DECEX1': DECIDE FOR (with FIRST option)                     
************************************************************************
DEFINE DATA LOCAL                                                       
1 #FUNCTION (A1)                                                        
1 #PARM     (A1)                                                        
END-DEFINE                                                              
*                                                                       
INPUT #FUNCTION #PARM                                                   
*                                                                       
DECIDE FOR FIRST CONDITION                                              
  WHEN #FUNCTION = 'A' AND #PARM = 'X'                                  
    WRITE 'Function A with parameter X selected.'                       
  WHEN #FUNCTION = 'B' AND #PARM = 'X'                                  
    WRITE 'Function B with parameter X selected.'                       
  WHEN #FUNCTION = 'C' THRU 'D'                                         
    WRITE 'Function C or D selected.'                                   
  WHEN NONE                                                             
    REINPUT 'Please enter a valid function.'                            
            MARK *#FUNCTION 
END-DECIDE
*         
END

Output of Program DECEX1:

#FUNCTION   #PARM

After entering A and Y and pressing ENTER: 

#FUNCTION A #PARM Y 
 
Please enter a valid function.

Example 2 - DECIDE FOR with EVERY Option

** Example 'DECEX2': DECIDE FOR (with EVERY option)                     
************************************************************************
DEFINE DATA LOCAL                                                       
1 #FIELD1 (N5.4)                                                        
END-DEFINE                                                              
*                                                                       
INPUT #FIELD1                                                           
*                                                                       
DECIDE FOR EVERY CONDITION                                              
  WHEN #FIELD1 >= 0                                                     
    WRITE '#FIELD1 is positive or zero.'                                
  WHEN #FIELD1 <= 0                                                     
    WRITE '#FIELD1 is negative or zero.'                                
  WHEN FRAC(#FIELD1) = 0                                                
    WRITE '#FIELD1 has no decimal digits.'                              
  WHEN ANY                                                              
    WRITE 'Any of the above conditions is true.'                        
  WHEN ALL                                                              
    WRITE '#FIELD1 is zero.'
  WHEN NONE
    IGNORE 
END-DECIDE
*          
END

Output of Program DECEX2:

#FIELD1 42

After pressing ENTER:

Page      1                                                  05-01-11  14:56:26
                                                                               
#FIELD1 is positive or zero.                                                   
#FIELD1 has no decimal digits.                                                 
Any of the above conditions is true.