输出helloworld

#include <iostream>

using namespace std;

int main()
{
	cout <<"#include <iostream>" << endl;
	cout << "using namespace std;" << endl;
	cout << "int main()" << endl;
	cout << "{" << endl;
	cout << "    cout << \"Hello, world!\";" << endl;
	cout << "return 0;";
	cout << "}"  << endl;
	
	return 0;
}