参考:https://sourceforge.net/p/predef/wiki/OperatingSystems/
#include <stdio.h>
int main() {
#if defined(_WIN16) || defined(_WIN32) || defined(_WIN64)
"windows");
printf(#elif defined(__linux__)
"linux");
printf(#elif defined(__APPLE__)
"apple");
printf(#else
"other");
printf(#endif
return 0;
}