已知一个补码形式的16位二进制数（低8位在NUM单位，高8位在NUM+1单位），试编写能求该16位二进制数原码的绝对值的程序。-Given a complement in the form of 16-bit binary number (NUM units in the low 8 high 8 in NUM+1 unit), try to be able to write the absolute value of the 16-bit binary code of the original program.