/sys$common/syshlp/helplib.hlb PASCAL, Declaration Section, Value Declaration *Conan The Librarian (sorry for the slow response - running on an old VAX) |
If you choose, you can use the VALUE section as a Compaq Pascal extension that initializes ordinal, real, array, record, set, and string variables. (If you require portable code, use the VALUE reserved word in either TYPE definitions or VAR declarations.) The exact form of an initialization depends on the type of the variable being initialized. Syntax: VALUE {variable-identifier := constant-expression};... The 'variable-identifier' is the name of the variable to be initialized. You can initialize a variable or variable component only once in the VALUE section. Any variables appearing in the VALUE section must appear in a previous VAR section. The 'constant-expression' is any constant expression that is assignment compatible with the variable identifier. Unlike other declaration sections, the VALUE section can appear only in a program or module declaration section. You cannot use the VALUE declaration section in procedures or functions. If you wish to initialize variables in procedures and functions, use an initial-state specifier (by using the VALUE reserved word in either the TYPE or VAR section). You can assign values to complete structured variables or to a single component of that variable. Example: VAR School : Record Class : Record Grades : Char; Order : Integer; End; Passed : Boolean; End; VALUE School := (('B', 14), TRUE); The constructor of School specifies a constant value of the correct type for each field in the record.
|