cpp version

#include <bits/stdc++.h>
using namespace std;

int main() {
    if (     __cplusplus == 202101L) std::cout << "C++23";
    else if (__cplusplus == 202002L) std::cout << "C++20";
    else if (__cplusplus == 201703L) std::cout << "C++17";
    else if (__cplusplus == 201402L) std::cout << "C++14";
    else if (__cplusplus == 201103L) std::cout << "C++11";
    else if (__cplusplus == 199711L) std::cout << "C++98";
    else std::cout << "__cplusplus: " << __cplusplus;
    std::cout << std::endl;
}