A
name is explicitly declared if it appears:
- In a DECLARE statement. The DECLARE statement explicitly declares
attributes of names.
- As an entry constant. Labels of PROCEDURE and ENTRY statements
constitute declarations of the entry constants within the containing
procedure.
- As a label constant. A label constant explicitly declares a
label.
- As a format constant. A label on a FORMAT statement constitutes
an explicit declaration of the label.
Notes:
- Naming an internal entry constant, a label constant, or a format constant
in a DECLARE statement is invalid.
- The bounds, if any, for a label or format constant are determined by the smallest
and largest values that are specified in any use of it as a label
in the source code.
The scope of an explicit declaration of a name is the block containing
the declaration. This includes all contained blocks, except those
blocks (and any blocks contained within them) to which another explicit
declaration of the same name is internal. In the following diagram,
the lines indicate the scope of the declaration of the names.
B and B' indicate the two distinct uses of the name B; C and C' indicate the two uses of the name C.
For more information about scope, refer to Scope of declarations.
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