实现ascii、hex码随意转换，支持中文汉字的hex码显示

STL文件读取程序（Matlab）：可以将ASCII格式的STL文件中的数据点信息及网格拓扑信息读出，并显示在屏幕上--a MATLAB program which gets the name of an ASCII STL (Stereolithography) file from the user, reads the 3D graphics information stored in the file, and displays the structure on the screen

实现一个文件阅读器，用于显示文本文件，文件的内容以ASCII字符格式和十六进制格式显示。显示屏幕规格为24*80，实现翻页翻行功能等功能-Implement a file reader, used to display text files, the file contents to ASCII character format and hexadecimal format. Display screen size is 24* 80 next page turn to achieve func

读写二进制文件，在UI上显示转为ASCII码形式。-Read and write the binary file,and show it in ascii