讀檔 解碼 翻譯 另存新檔

題目：

Hiev$Hypgmi0
M$eq$jmjxiir$erh$M$lezi$xs$wlevi$e$vssq${mxl$q}$rmri1}iev1sph$wmwxiv2
Wli$mw$ziv}$yrxmh}$erh$M$lezi$xs$gpier$yt$liv$qiww$epp$xli$xmqi2$
Wli$riziv$pieziw$q}$xlmrkw$epsri$erh$oiitw$stirmrk$q}$hve{ivw$erh$pssomrk$ex$iziv}xlmrk$mrwmhi2$
Rsxlmrk$M$lezi$mw$tvmzexi2$Epws0$M!‥q$rsx$epps{ih$xs$hs${lex$M${erx$xs$hs2$
Qsq$we}w$M$qywx$xyvr$q}$vehms$sjj$ex$rmklx$figeywi$xli$rsmwi$oiitw$q}$wmwxiv$e{eoi2
[lex$ger$M$hsC
Pmrhe

上列亂碼是由原來的ASCII碼加4後所得，請寫MATLAB程式將其還原，並將內容翻譯成中文。

讀入檔案 翻譯後 寫入另一檔案

題目：

Silverlight is a powerful development platform for creating engaging, interactive user experiences for Web, desktop, and mobile applications when online or offline. Silverlight is a free plug-in, powered by the .NET framework and compatible with multiple browsers, devices and operating systems, bringing a new level of interactivity wherever the Web works. Silverlight 4 adds a ton of new features, like webcam, microphone, and printing, to enable you to create incredible applications.

以上短文是由網路上擷取而來。將文章存為一以ASCII編碼的文件，以MATLAB讀取並將大小寫互換，在另存新檔。