有3个无符号字节数依次存放在BUF1开始的存储区中，编程将它们从大到小排列并依次存放在BUF2开始的存储区中。-Has three unsigned number of bytes stored in BUF1 followed by the beginning of storage area, the program will be arranged and followed their smallest BUF2 stored in the storage area in the begin