contributed by < eric5800602 >
開發環境
$ uname -a
Linux os2018 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ gcc --version
gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit