(bison.info) Value Type

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(bison.info) Semantics

(bison.info) Multiple Types

 
 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 C declarations section of the
 grammar file ( Outline of a Bison Grammar Grammar Outline.).
 

Info Catalog

(bison.info) Semantics

(bison.info) Multiple Types