package com.tenwa.app.invoice.utils;

import java.math.BigDecimal;

public class MathUtil {

	 /** 
     * 加法运算
     * @param m1 
     * @param m2 
     * @return 
     */ 
    public static double add(double m1, double m2) {
        BigDecimal p1 = new BigDecimal(Double.toString(m1));
        BigDecimal p2 = new BigDecimal(Double.toString(m2));
        return p1.add(p2).doubleValue();
    }

    /** 
     * 减法运算
     * @param m1 
     * @param m2 
     * @return 
     */ 
    public static double sub(double m1, double m2) {
        BigDecimal p1 = new BigDecimal(Double.toString(m1));
        BigDecimal p2 = new BigDecimal(Double.toString(m2));
        return p1.subtract(p2).doubleValue();
    }

    /** 
     * 乘法运算
     * @param m1 
     * @param m2 
     * @return 
     */ 
    public static double mul(double m1, double m2) {
        BigDecimal p1 = new BigDecimal(Double.toString(m1));
        BigDecimal p2 = new BigDecimal(Double.toString(m2));
        return p1.multiply(p2).doubleValue();
    }


     /**    
      *  除法运算
      *   @param   m1  
      *   @param   m2        
      *   @param   scale      
      *   @return     
      */     
    public static double div(double m1, double m2, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("Parameter error");
        }
        BigDecimal p1 = new BigDecimal(Double.toString(m1));
        BigDecimal p2 = new BigDecimal(Double.toString(m2));
        return p1.divide(p2, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
    } 

	 
}