计算校验和程序，程序要求以命令行方式运行：Checksum inputfile outputfile

其中Checksum是程序名；inputfile是输入文件，其中包含数据字段封装的内容；outputfile为输出文件，该文件保存封装后的整数据报。-Calculate the checksum and procedures, program requirements to run from command line: the Checksum inputfile outputfile including Checksum is the name of the program　inputfile is the input file, which contains the contents of the data field encapsulation　outputfile for output file, save the file after the whole package data reported.