parser.h

用VC++实现了一个编译器的功能

#ifndef PARSER_H
#define PARSER_H

#include "scanner.h"
 
typedef double(* FuncPtr)(double);

struct ExprNode
{  enum Token_Type OpCode;
   union
   {  struct { ExprNode *Left,*Right; }CaseOperator;
      struct { ExprNode *Child;  FuncPtr MathFuncPtr;  }CaseFunc;
      double CaseConst;
	  double *CaseParmPtr;
   }Content;
};

extern void Parser(char *SrcFilePtr);
//extern double GetExprValue(struct ExprNode *root);
//extern void DelExprTree(struct ExprNode *root);

#endif