四则运算5.2-5.3

import java.text.DecimalFormat;
import java.math.RoundingMode;
public class Core {
	private int MAXNUM=10;//操作数
	private int OP=10;	//运算符
	private int MAXrange=1000;//数值范围 
	private int MINrange=-1000;//数值范围 
	private int JD=2;//计算精度
	public Core(int MAXNUM,int OP,int MAXrange,int MINrange,int JD){
		this.MAXNUM=MAXNUM;
		this.OP=OP;
		this.MAXrange=MAXrange;
		this.MINrange=MINrange;
		this.JD=JD;
	}
	public Core(){
		this.MAXNUM=10;
		this.OP=10;	
		this.MAXrange=1000;
		this.MINrange=-1000;
		this.JD=2;
	}
	public void setMAXNUM(int MAXNUM){
		this.MAXNUM=MAXNUM;
	}
	public void setOP(int OP){
		this.OP=OP;
	}
	public void setMAXrange(int MAXrange){
		this.MAXrange=MAXrange;
	}
	public void setMINrange(int MINrange){
		this.MINrange=MINrange;
	}
	public void setJD(int JD){
		this.JD=JD;
	}
	
	public String jisuan(String str) throws cuowu  {
		String num[] =new String[MAXNUM];
		int number[] =new int[MAXNUM];
		char operator[]=new char [OP];
		int brackets=0,endbrackets=0;
		int posbra=0,endposbra=0;
		int j;int k;
		double result=0;
		boolean flag;
		for(int i=0;i='0' && str.charAt(i)<='9' ||  str.charAt(i)=='.')
			{
				flag=false;
				num[j]=num[j]+ str.charAt(i);
			}
			else if(str.charAt(i)=='+' || str.charAt(i)=='-' || str.charAt(i)=='*' || str.charAt(i)=='/')
			{
				if(flag==true) throw new cuowu("公式错误！不能连续输入运算符");
				flag=true;
				j++;
				if(j>MAXNUM-1)
					throw new cuowu("操作数不能超过"+MAXNUM+"个！");
				if(k>OP-1)
					throw new cuowu("运算符不能超过"+OP+"个！");
				operator[k]=str.charAt(i);
				k++;
			}
			else if(str.charAt(i)=='(')
			{
				brackets++;
				posbra=i;
			}else if(str.charAt(i)==')'){
				endbrackets++;
			}
		}	
		if(brackets!=endbrackets)
			throw new cuowu("括号不对称！");

		for(int i=0;i<=j;i++)
			if(Double.parseDouble(num[i])>MAXrange || Double.parseDouble(num[i]) 
 
public class Calculator {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String exp=new String("10.5222+10.222=");
		Core c=new Core(10,10,500,-500,4);
		try{
			String result=c.jisuan(exp);
			System.out.print(result);
		}
		catch(cuowu e){
			e.printStackTrace();
		}
	}
}