#include "parser.h"


	#include <windows.h>
	#include <wingdi.h>
	extern HDC hDC;
  #define red   RGB(255, 0, 0)  //紅色
  #define black RGB(0, 0, 0)    //白色


extern void   DrawPixel(unsigned long x, unsigned long y); //繪制一個點
extern double GetExprValue(struct ExprNode * root);  //獲得表達式的值
extern void   DrawLoop(double Start,                 //圖形繪制
											 double End,
											 double Step,
											 struct ExprNode * HorPtr,
											 struct ExprNode * VerPtr);
extern void   DelExprTree(struct ExprNode * root);   //刪除一棵樹