由於公司忙左幾日，無得冗，積左一大堆好軟件要介紹，又因為有很多是免費期有限，唯有選擇性地寫啦．
這個是一常用之工程計算機，原價US$0.99，現在又係免費，免費期又是有限．
工程計算機係咩？？？對不起，我也不知道，我連中學時丟SIN,COS,TAN都好好咁物歸原主，全部還了給老師．
而Classic RPN Calculator看作者說明，看似很強．（但我平常只用＋－）
The calculator features a four level stack, a generous classic-style dot matrix display and 10 storage registers. All common logarithmic and trigonometric functions are supported as well as more than a dozen conversion routines for weights, lengths, consumption etc. RPN aficionados will love the stack roll function and the Last X register.
有需要之朋友自己下吧
下載位置
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=288886681&mt=8
