9/7/2017
little-endian:change the byte order of the number to have the lowest byte first (the bits within each byte still have highest order bit first).
decimal:十進(jìn)制
hexadecimal:16進(jìn)制
converter C program
http://www.firmcodes.com/write-c-program-convert-little-endian-big-endian-integer/
http://www.coders-hub.com/2013/04/convert-little-endian-to-big-endian-in-c.html#.WbHnilUrKUk
C read file: