java中浮点数做运算,Java中浮点数的精确运算方法

package com.lv;

import java.math.BigDecimal;

public class Arith {

public static double add(double v1,double v2){

BigDecimal b1=new BigDecimal(Double.toString(v1));

BigDecimal b2=new BigDecimal(Double.toString(v2));

return b1.add(b2).doubleval_rue();

}

public static double sub(double v1,double v2){

BigDecimal b1=new BigDecimal(Double.toString(v1));

BigDecimal b2=new BigDecimal(Double.toString(v2));

return b1.subtract(b2).doubleval_rue();

}

public static double mul(double v1,double v2){

BigDecimal b1=new BigDecimal(Double.toString(v1));

BigDecimal b2=new BigDecimal(Double.toString(v2));

return b1.multiply(b2).doubleval_rue();

}

public static double div(double v1,double v2){

BigDecimal b1=new BigDecimal(Double.toString(v1));

BigDecimal b2=new BigDecimal(Double.toString(v2));

return b1.divide(b2,10,BigDecimal.ROUND_HALF_UP).doubleval_rue();

}

public static double div(double v1,double v2,int scale){

if(scale<0){

throw new IllegalArgumentException(

"The scale must be a positive integer or zero");

}

BigDecimal b1=new BigDecimal(Double.toString(v1));

BigDecimal b2=new BigDecimal(Double.toString(v2));

return b1.divide(b2, scale,BigDecimal.ROUND_HALF_UP).doubleval_rue();

}

public static double round(double v,int scale){

if(scale<0){

throw new IllegalArgumentException(

"The scale must be a positive integer or zero");

}

BigDecimal b=new BigDecimal(Double.toString(v));

BigDecimal one=new BigDecimal(1);

return b.divide(one,scale,BigDecimal.ROUND_HALF_UP).doubleval_rue();

}

public static void main(String [] args){

Arith arith=new Arith();

System.out.println(arith.div(13,3));

}

}

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好文不易，鼓励一下吧！