1. #include <iostream>
    2. #include <sstream>
    4. using namespace std;
    6. std::string ver_srting(int a, int b, int c) {
    7.     std::ostringstream ss;
    8.     ss << a << '.' << b << '.' << c;
    9.     return ss.str();
    10. }
    12. int main() {
    13.     std::string true_cxx = 
    14. #ifdef __clang__
    15.     "clang++";
    16. #else
    17.     "g++";
    18. #endif
    20.     std::string true_cxx_ver = 
    21. #ifdef __clang__
    22.     ver_srting(__clang_major__, __clang_minor__, __clang_patchlevel__);
    23. #else
    24.     ver_srting(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__);
    25. #endif
    27.     cout << true_cxx << endl;
    28.     cout << true_cxx_ver << endl;
    30.     return 0;
    31. }