#include <iostream>	// istream (e.g. cin) ostream (e.g. cout) stuff
#include <fstream>	// file stuff
#include <string>	// string stuff
#include <ctype.h>

using namespace std;

int main(int argc, char* argv[] )
{
	string fileName = "test.txt"; // a string containing a filename

	// The ifstream object constructor opens the file (or at least tries to...)
	// The constructor cannot accept a string object argument, so you have to use
	// the c_str() method of string to convert the string to an array of characters,
	// which the constructor will accept. 
	ifstream fileInputStream( fileName.c_str() );
	
	// There are two ways to test whether the ifstream object is actually hooked
	// to an open file:
	if( !fileInputStream )	// just check the stream object itself...
//	if( !fileInputStream.is_open() ) // or use the is_open() method
	{
		cerr << "Opening input file " << fileName << " failed!" << endl;
		exit( EXIT_FAILURE );
	}

	ofstream fileOutputStream( "test.out" );
	
	if( !fileOutputStream.is_open() ) // use the is_open() method
	{
		cerr << "Opening output file " << "test.out" << " failed!" << endl;
		exit( EXIT_FAILURE );
	}

	string strText; // a string used to hold a line of text from the input file
	while( getline(fileInputStream, strText) )
	{
		fileOutputStream << strText << endl; // echo from input file to output file
	}

	fileInputStream.close();	// not needed, would be called automatically...
	fileOutputStream.close();	// not needed, would be called automatically...

	return EXIT_SUCCESS;
}