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package com.math.tools;
import java.math.BigDecimal;
public class Arith {
private static final int DEF_DIV_SCALE=10;
private Arith(){
;
}
public static String add(double v1,double v2){
BigDecimal b1=new BigDecimal(Double.toString(v1));
BigDecimal b2=new BigDecimal(Double.toString(v2));
return String.valueOf(b1.add(b2));
}
public static String add(String v1,String v2){
BigDecimal b1=new BigDecimal(v1);
BigDecimal b2=new BigDecimal(v2);
return String.valueOf(b1.add(b2));
}
public static String sub(double v1,double v2){
BigDecimal b1=new BigDecimal(Double.toString(v1));
BigDecimal b2=new BigDecimal(Double.toString(v2));
return String.valueOf(b1.subtract(b2));
}
public static String sub(String v1,String v2){
BigDecimal b1=new BigDecimal(v1);
BigDecimal b2=new BigDecimal(v2);
return String.valueOf(b1.subtract(b2));
}
public static String mul(double v1,double v2){
BigDecimal b1=new BigDecimal(Double.toString(v1));
BigDecimal b2=new BigDecimal(Double.toString(v2));
return String.valueOf(b1.multiply(b2));
}
public static String mul(String v1,String v2){
BigDecimal b1=new BigDecimal(v1);
BigDecimal b2=new BigDecimal(v2);
return String.valueOf(b1.multiply(b2));
}
public static String div(double v1,double v2){
return div(v1,v2,DEF_DIV_SCALE);
}
public static String div(String v1,String v2){
return div(v1,v2,DEF_DIV_SCALE);
}
public static String 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 String.valueOf(b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP));
}
public static String div(String v1,String v2,int scale){
if(scale<0){
throw new IllegalArgumentException(
"the scale must be a positive integer or zero");
}
BigDecimal b1=new BigDecimal(v1);
BigDecimal b2=new BigDecimal(v2);
BigDecimal result=null;
try{
result=b1.divide(b2);
}catch (Exception e){
result =b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP);
}
return String.valueOf(result);
}
public static String round(double v,int scale){
if(scale<0){
throw new IllegalArgumentException("the scale integer or zero");
}
BigDecimal b=new BigDecimal(Double.toString(v));
BigDecimal one=new BigDecimal("1");
return String.valueOf(b.divide(one,scale,BigDecimal.ROUND_HALF_UP));
}
public static String round(String v,int String,int scale){
if(scale<0){
throw new IllegalArgumentException(
"interger or int");
}
BigDecimal b=new BigDecimal(v);
BigDecimal one=new BigDecimal("1");
b.divide(one,scale,BigDecimal.ROUND_HALF_UP);
return null;
}
}
if (scale < 0) {
throw new IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b = new BigDecimal(v);
BigDecimal one = new BigDecimal(string);
return String.valueOf(b.divide(one, scale, BigDecimal.ROUND_HALF_UP));
}