/* Checking which operating system we are compiling on by using ifdef (if defined) see: https://msdn.microsoft.com/en-us/library/ew2hz0yd.aspx Here is a list of OS definitions: __linux__ Defined on Linux __sun Defined on Solaris __FreeBSD__ Defined on FreeBSD __NetBSD__ Defined on NetBSD __OpenBSD__ Defined on OpenBSD __APPLE__ Defined on Mac OS X __hpux Defined on HP-UX __osf__ Defined on Tru64 UNIX (formerly DEC OSF1) __sgi Defined on Irix _AIX Defined on AIX _WIN32 Defined on Windows Looks like sololearn is running windows */ #include #include int main() { std::string cpu; std::string OS; std::string GCCVer; //Processor Type #ifdef __amd64__ { cpu = "AMD 64bit\n"; } #elif __IA64__ { cpu = "Itanium 64 bit\n"; } #elif __x86_64__ {cpu = "Intel x86 64bit\n";} #elif __X86__ { cpu = "Intel x86\n"; } #elif __i686__ {cpu="Intel 686\n";} #elif __i486__ { cpu = "Intel 486\n"; } #elif __i586__ { cpu = "Intel 586\n"; } #elif __i386__ { cpu = "Intel 386\n"; } #else { cpu = "Unknown\n"; } #endif // Operating System #ifdef __linux__ { OS = "Linux\n"; } #elif __sun { OS = "Solaris\n";} #elif __FreeBSD__ { OS = "FreeBSD\n";} #elif __NetBSD__ { OS = "NetBSD\n";} #elif __OpenBSD__ { OS = "OpenBSD\n";} #elif __APPLE__ { OS = "Mac OS X\n";} #elif __hpux { OS = "HP-UX\n";} #elif __osf__ { OS ="Tru64 UNIX\n";} #elif __sgi { OS ="Irix\n";} #elif _AIX { OS = "AIX\n";} #elif _WIN32 { OS = "Windows\n";} #else { OS = "Unknown\n"; } #endif //GCC Version #ifdef __GLIBCXX__ { GCCVer = "3.4.0+"; } #elif __GLIBCPP__ { GCCVer = "Between 3.0.0 and 3.4.0"; } #else { GCCVer = "Unknown"; } #endif std::cout << "Processor: " << cpu; std::cout << "Operating System: " << OS; std::cout << "GCC Version: " << GCCVer; return 0; }

What OS is this?