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 Data Types of Semantic Values
 -----------------------------
 
    In a simple program it may be sufficient to use the same data type
 for the semantic values of all language constructs.  This was true in
 the RPN and infix calculator examples ( Reverse Polish Notation
 Calculator RPN Calc.).
 
    Bison's default is to use type `int' for all semantic values.  To
 specify some other type, define `YYSTYPE' as a macro, like this:
 
      #define YYSTYPE double
 
 This macro definition must go in the prologue of the grammar file
 ( Outline of a Bison Grammar Grammar Outline.).
 

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(bison.info.gz) Semantics

(bison.info.gz) Multiple Types