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A data type determines the set of values that variables of that type may assume, and the operators that are applicable. A type declaration associates an identifier with a type. If it is a structured type, such as arrays, records, sets, file types, classes and class references, it also defines the structure of variables of this type. Non-structured types are basic types, enumerations, subrange types, pointer types, and procedure types. A type declaration can also refer to a simple type which is a (possibly qualified) identifier of another already existing type, or an enumeration or a subrange type. Finally, a type declaration can also introduce a string type.
type_decl ::= <identifier> = type type ::= simple_type ::= string_type ::= pointer_type ::= procedure_type ::= structured_type ::= PACKED structured_type simple_type ::= qualident ::= enumeration ::= subrange_type structured_type ::= array_type ::= record_type ::= set_type ::= file_type ::= class_type ::= class_ref_type |
Examples:
Table = ARRAY [0..N-1] OF REAL
Tree = ^Node
Node = RECORD
key : INTEGER;
left, right : Tree
END
CenterTree = ^CenterNode
CenterNode = RECORD
basic : Node;
width : INTEGER;
subnode : Tree;
END
Func = FUNCTION( i : INTEGER ) : INTEGER
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Canterbury Pascal for JVM (Last documentation update
Sep 02, 2004)
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