#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;

int main(int argc, char **argv)
{
	ofstream ofs("outfile");
	if (!ofs) {
		cerr << argv[0] << ": couldn't open outfile\n";
		return EXIT_FAILURE;
	}

	const int a[] = {10, 20, 30};
	const size_t n = sizeof a / sizeof a[0];

	for (const int *p = a; p < a + n; ++p) {
		//if (operator<<(ofs.operator<<(*p), "\n").operator!()) {
		if (!(ofs << *p << "\n")) {
			return EXIT_FAILURE;
		}
	}

	return EXIT_SUCCESS;
}