#include <thread>
#include <string>
#include <iostream>

/*
 * Compile with 'g++ -pthread a.cpp'
 *
 * The order of printing is not well-defined
 */

using namespace std;

void f1() {
	cout << "Hello ";
}

void f2(const std::string& s) {
	cout << s << endl;
}

int main() {
	thread t1(f1);
	thread t2{f2, "Parallel World!"};

	t1.join();
	t2.join();

	return 0;
}