expression.h

ARM 下的表达式计算的不错的代码

/****************************************Copyright (c)**************************************************
**                               
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: 		Expression.h
** Created By: 		ZhaoSong
** Created date:   	2007-08-1
** Version:			T10
** Descriptions: 	
**
**------------------------------------------------------------------------------------------------------
** Modified by:		
** Modified date:	
** Version:			
** Descriptions:
**
********************************************************************************************************/

#ifndef	EXPRESSION_H
#define EXPRESSION_H

#include "default_def.h"

#define	OPRATOR_CNT	 19	
#define OPRAND_BUFF_SIZE	15
#define OPRATOR_BUFF_SIZE	10

typedef	struct tagOprandStack
{
	float	fBuff[OPRAND_BUFF_SIZE];
	u8		uTop;
}S_OprandStack;

typedef	struct tagOpratorStack
{
	char	cBuff[OPRATOR_BUFF_SIZE];
	u8		uTop;
}S_OpratorStack;

float EvaluateExpression(char *pExpression,float *pPara);
u8	GetInt(char *pExpression,u32 *pValue);
char Precede(char cStackOp,char cExOp);
float Operate(char cOprator,float fLeftValue,float fRightValue);





#endif