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Variable Declarations

Variable declarations serve to introduce and associate them with a unique identifier and a data type.

var_decl       ::= var_ident_list : type
var_ident_list ::= var_ident_list , var_ident
               ::= var_ident
var_ident      ::= identdef
               ::= identdef [ <string> ]
               ::= identdef java_name

In this compiler, if the generated Java identifier is to be different from the variable identifier, that Java identifier may be specified after the Oberon-2 identifier, either as a string or as a JAVA NAME directive.

Record and pointer variables have both a static type and a dynamic type (the type they assume at run time). For pointers and variable parameters of record type, the dynamic type may be an extension of their static type. The static type determines which fields of a record are accessable. The dynamic type is used to call type-bound procedures (also known as methods in Java).

Examples of variable declarations (see also section about type declarations):

  i,j,k : INTEGER

  x,y : REAL

  p, q : BOOLEAN

  s : SET

  F : Function

  a : ARRAY 100 OF REAL

  w : ARRAY 16 OF RECORD
        name : ARRAY 32 OF CHAR;
        count : INTEGER;
      END

  t,c : Tree


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Canterbury Oberon-2 for Java  (Last documentation update Feb 8, 2000)
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