package com.moral.util;

import java.math.BigDecimal;

/**
 * @ClassName MathUtils
 * @Description 运算工具类
 * @Author 陈凯裕
 * @Date 2021/9/13 9:54
 * @Version TODO
 **/
public class MathUtils {

    /**
     * @Description: 计算double类型加法
     * @Param: [v1, v2]
     * @return: double
     * @Author: 陈凯裕
     * @Date: 2021/9/13
     */
    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).doubleValue();
    }


    /**
     * @Description: 计算double类型减法
     * @Param: [v1, v2]
     * @return: double
     * @Author: 陈凯裕
     * @Date: 2021/9/13
     */
    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).doubleValue();
    }

    /**
     * @Description: 计算double类型乘法
     * @Param: [v1, v2]
     * @return: double
     * @Author: 陈凯裕
     * @Date: 2021/9/13
     */
    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).doubleValue();
    }

    /**
    * @Description: 除法，accurate为保留小数位
            * @Param: [a, b, accurate]
            * @return: double
            * @Author: 陈凯裕
            * @Date: 2021/11/2
            */
    public static double division(double a, double b,int accurate) {
        if (accurate < 0) {
            throw new RuntimeException("精确度必须是正整数或零");
        }
        BigDecimal b1 = new BigDecimal(a);
        BigDecimal b2 = new BigDecimal(b);
        return b1.divide(b2, accurate, BigDecimal.ROUND_HALF_UP).doubleValue();
    }
}