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 (see section Reverse Polish Notation Calculator).
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
(see section Outline of a Bison Grammar).
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