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// 4.1: direttiva extern
#include <iostream>

using namespace std;

class A { 
	public:
		int x;
};

// istanza extern
extern A a_globale;

// codice C extern
extern "C" {
	const char *strerror(int);
};

void main() {
	//cout << a_globale.x << endl; // ERRORE: undefined reference
}