在BUF数据区中放有三个双字节数，现要求将这三个数按从大到小次序重新存放。分别将这些数视为有符号数和无符号数这两种情况编写程序。-Placed in BUF data area has three double-byte number, are required by these three numbers beginning with the largest order of re-deposited. There were signs of these numbers as unsigned