判断系统是什么操作系统

#include <iostream>

int main() {
#if defined(_WIN32) || defined(_WIN64)
    std::cout << "This is a Windows system." << std::endl;
    
#elif defined(__linux__)
    std::cout << "This is a Linux system." << std::endl;
    
#elif defined(__APPLE__) || defined(__MACH__)
    std::cout << "This is a MacOS system." << std::endl;
    
#elif defined(__ANDROID__)
    std::cout << "\UffffffffThis is a ANDROID system." << std::endl;
    
#else
    std::cout << "Unknown operating system." << std::endl;
    
#endif
    return 0;
}

参考：https://blog.csdn.net/u013576331/article/details/143657090

https://blog.csdn.net/raoxiaoya/article/details/131391468

https://blog.csdn.net/universsky2015/article/details/135783867