Micro Focus Enterprise Developer 2.3 Update 2 for Eclipse > Programming > Mainframe Programming > AppMaster Builder > Reference > S-COBOL Structures > TRUE/FALSE

TRUE/FALSE

Establish flags, set them to true and false, and then test them.

Restriction: This topic applies only when the AppMaster Builder AddPack has been installed, and applies only to Windows platforms.

Syntax:

TRUE|FALSE dataname1 [dataname2 [... datanameN]]

General Rules:

For each dataname coded, S-COBOL provides an 02-level conditional variable and an associated 88-level condition name entry in an 01 GENERATED-FLAGS area of Working-Storage. AMB adds a --FLG suffix to dataname to create the 02-level entry, and dataname itself becomes the 88-level entry. AMB always assigns VALUE 'T' to the 88-level condition name, never VALUE 'F'. For example
The following code in the Procedure Division
```
      .
      .
TRUE THERE-ARE-NO-ERRORS
FALSE WITHIN-RANGE
      .
       .
       .
```
Generates
```
WORKING-STORAGE SECTION.
       .
       .
02  THERE-ARE-NO-ERRORS--FLG    PIC X.
    88  THERE-ARE-NO-ERRORS    VALUE 'T'.
02  WITHIN-RANGE--FLG    PIC X.
    88  WITHIN-RANGE    VALUE 'T'.
```
If, for debugging purposes, you want to display a generated flag, add the --FLG suffix to dataname in the DISPLAY statement. For example, TRUE THERE-ARE-NO-ERRORS generates MOVE TRUE TO THERE-ARE-NO-ERRORS--FLG.
If only true statements, such as TRUE WITHIN-RANGE, or only false statements, such as FALSE WITHIN-RANGE, are coded for dataname, a warning message indicates a logic error.
S-COBOL minimizes the code required to test the flags established and set by the TRUE/FALSE verbs.
- Code WHILE THERE-ARE-NO-RECORDS instead of WHILE THERE-ARE-NO-RECORDS--FLG = TRUE.
- Code IF NOT WITHIN-RANGE instead of IF WITHIN-RANGE--FLG = FALSE.

Example:

Set two undefined flags, THERE-ARE-NO-ERRORS and WITHIN-RANGE to TRUE (line 3030). Define these flags in Working-Storage (88-level condition name flags), because this is the first TRUE or FALSE statement for either flag in this program. If the condition in line 3060 is true, set the THERE-ARE-NO-ERRORS flag to FALSE. If either condition in line 3110 is true, set the WITHIN-RANGE flag to FALSE. As long as the value of the THERE-ARE-NO-ERRORS flag is TRUE, perform the loop. Inside the loop test the other flag, WITHIN-RANGE. If the value is TRUE, execute the subordinate statement block.

.
003030         TRUE THERE-ARE-NO-ERRORS 
003031         ... WITHIN-RANGE
   .
003060         IF CODE-IN NOT NUMERIC
003070             FALSE THERE-ARE-NO-ERRORS
   .
003110         IF COUNT > 372 OR COUNT < 50
003120             FALSE WITHIN-RANGE
   .
003150         WHILE THERE-ARE-NO-ERRORS
003160             IF WITHIN-RANGE