#include <iostream>   //C++ example
#include <fstream>
#include <cstdlib>
using namespace std;

int main()
{
	ofstream out1("outfile1");                  //overwrite
	if (!out1) {                                //if (out1.operator!()) {
		cerr << "can't open outfile1\n";
		return EXIT_FAILURE;
	}

	ofstream out2("outfile2", ios_base::app);   //append
	if (!out2) {
		cerr << "can't open outfile2\n";
		return EXIT_FAILURE;
	}

	out1 << "hello\n";
	out2 << "goodbye\n";
	return EXIT_SUCCESS;   //Call destructors for out2 and out1.
}