gcc(g++)에서 지원하는 C++ STL version 확인하기

	// for checkg support C++ (using g++)
	//
	// g++ -std=c++98 main.cpp
	// g++ -std=c++03 main.cpp
	// g++ -std=c++0x main.cpp
	// g++ -std=c++11 main.cpp
	// g++ -std=c++14 main.cpp
	// g++ -std=c++17 main.cpp
	#include <iostream>
	using namespace std;
	int main(){
	int cpp = (int) __cplusplus;
	int year = cpp / 100; // 1997 ... 2017
	int month = cpp % 100;
	cout << "Year:" << year << " Month:" << month << endl;
	return 0;
	}

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