public?class?ArithHelper?{

????//?默認(rèn)除法運(yùn)算精度
????private?static?final?int?DEF_DIV_SCALE?=?16;

????//?這個(gè)類(lèi)不能實(shí)例化
????private?ArithHelper（）?{
????}

????/**
?????*?提供精確的加法運(yùn)算。
?????*
?????*?@param?v1?被加數(shù)
?????*?@param?v2?加數(shù)
?????*?@return?兩個(gè)參數(shù)的和
?????*/

????public?static?double?add（double?v1?double?v2）?{
????????java.math.BigDecimal?b1?=?new?java.math.BigDecimal（Double.toString（v1））;
????????java.math.BigDecimal?b2?=?new?java.math.BigDecimal（Double.toString（v2））;
????????return?b1.add（b2）.doubleValue（）;
????}

????public?static?double?add（String?v1?String?v2）?{
????????java.math.BigDecimal?b1?=?new?java.math.BigDecimal（v1）;
????????java.math.BigDecimal?b2?=?new?java.math.BigDecimal（v2）;
????????return?b1.add（b2）.doubleValue（）;
????}

????/**
?????*?提供精確的減法運(yùn)算。
?????*
?????*?@param?v1?被減數(shù)
?????*?@param?v2?減數(shù)
?????*?@return?兩個(gè)參數(shù)的差
?????*/

????public?static?double?sub（double?v1?double?v2）?{
????????java.math.BigDecimal?b1?=?new?java.math.BigDecimal（Dou

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----

?????文件????????301??2017-11-11?22:05??Calculator\.classpath

?????文件????????386??2017-11-11?22:05??Calculator\.project

?????文件????????598??2017-11-11?22:05??Calculator\.settings\org.eclipse.jdt.core.prefs

?????文件???????2732??2017-11-11?22:05??Calculator\bin\ArithHelper.class

?????文件???????4359??2017-11-11?22:05??Calculator\bin\Calculator.class

?????文件????????747??2017-11-11?22:05??Calculator\bin\Main$1.class

?????文件???????2122??2017-11-11?22:05??Calculator\bin\Main.class

?????文件????????692??2017-11-11?22:05??Calculator\bin\Mainframe$1.class

?????文件????????898??2017-11-11?22:05??Calculator\bin\Mainframe$10.class

?????文件???????3494??2017-11-11?22:05??Calculator\bin\Mainframe$11.class

?????文件????????898??2017-11-11?22:05??Calculator\bin\Mainframe$12.class

?????文件???????1030??2017-11-11?22:05??Calculator\bin\Mainframe$2.class

?????文件????????896??2017-11-11?22:05??Calculator\bin\Mainframe$3.class

?????文件???????1087??2017-11-11?22:05??Calculator\bin\Mainframe$4.class

?????文件???????1022??2017-11-11?22:05??Calculator\bin\Mainframe$5.class

?????文件???????1118??2017-11-11?22:05??Calculator\bin\Mainframe$6.class

?????文件???????1099??2017-11-11?22:05??Calculator\bin\Mainframe$7.class

?????文件????????896??2017-11-11?22:05??Calculator\bin\Mainframe$8.class

?????文件????????896??2017-11-11?22:05??Calculator\bin\Mainframe$9.class

?????文件??????17089??2017-11-11?22:05??Calculator\bin\Mainframe.class

?????文件???????5105??2017-11-11?22:05??Calculator\src\ArithHelper.java

?????文件???????6701??2017-11-11?22:05??Calculator\src\Calculator.java

?????文件???????1618??2017-11-11?22:05??Calculator\src\Main.java

?????文件??????28550??2017-11-11?22:05??Calculator\src\Mainframe.java

?????目錄??????????0??2017-11-11?22:05??Calculator\.settings

?????目錄??????????0??2017-11-11?22:05??Calculator\bin

?????目錄??????????0??2017-11-11?22:05??Calculator\src

?????目錄??????????0??2017-11-11?22:05??Calculator

-----------?---------??----------?-----??----

????????????????84334????????????????????28

............此處省略1個(gè)文件信息