F gray_encode(n)
   R n (+) n >> 1

F gray_decode(=n)
   V m = n >> 1
   L m != 0
      n (+)= m
      m >>= 1
   R n

print(‘DEC,   BIN =>  GRAY => DEC’)
L(i) 32
   V gray = gray_encode(i)
   V dec = gray_decode(gray)
   print(‘ #2, #. => #. => #2’.format(i, bin(i).zfill(5), bin(gray).zfill(5), dec))