import?java.math.BigDecimal;
public?class?Example?{
????public?static?void?main（String?args[]）?{
????????BigDecimal?sum?=?new?BigDecimal（0.0）;?//?和
????????BigDecimal?factorial?=?new?BigDecimal（1.0）;?//?階乘項的計算結果
????????int?i?=?1;?//?循環增量
????????while?（i?<=?20）?{
????????????sum?=?sum.add（factorial）;?//?累加各項階乘的和
????????????++i;?//?i加1
????????????factorial?=?factorial.multiply（new?BigDecimal（1.0?/?i））;?//?計算階乘項
????????}
????????System.out.println（“1+1／2!+1／3!···1／20!的計算結果等于：\n“?+?sum）;?//?輸出計算結果
????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????301??2010-07-08?11:41??.classpath
?????文件?????????379??2010-09-07?10:57??.project
?????文件?????????635??2010-07-08?11:41??.settings\org.eclipse.jdt.core.prefs
?????文件????????1061??2013-11-21?08:40??bin\Example.class
?????文件?????????573??2010-07-08?15:41??src\Example.java