// File ex8-ll.cpp
#include <fstream>
#include <iostream>
#include <cstdlib>
using namespace std;

void print_file(istream&);

int main() {

	// Declare and open an output file stream
	ofstream fout("da_file");
	
	// Check the file open
	if (!fout) {
		cerr << "I can't open \"da_file\"\n";
		exit (EXIT_FAILURE);
	}
	
	// write 3 lines into a new file
	fout << "Have a nice day.\n";	
	fout << "Have a great day.\n";
	fout << "Have a totally excellent day.\n";
	
	// close the file
	fout.close();
	
	// re-open the file as an fstream object for input and output
	fstream finout("da_file",ios_base::in|ios_base::out);
	
	print_file(finout);
	
	// clear the EOF bit
	finout.clear();
	
	// position to byte 7 in the file
	finout.seekp(7,ios::beg);
	
	// Are the get and put pointers the same?
	cout<< "finout.tellg()=" << finout.tellg()<< endl;
	cout<< "finout.tellp()=" << finout.tellp()<< endl;
	
	// replace "nice" with "fine"
	finout<< "fine";
	
	// Are the get and put pointers still the same?
	cout<< "finout.tellg()="<< finout.tellg()<< endl;
	cout << "finout.tellp()=" << finout.tellp() << endl;
	
	print_file(finout);
	
	// close the file
	finout.close();
	
	// reopen the file in input/output/binary mode
	finout.open("da_file",ios_base::in|ios_base::out|ios::binary);
	
	// write hey into the file
	finout<< "hey";
	
	print_file(finout);
	
	// try again to write hey into the file
	finout.seekp(0,ios::beg);
	finout<< "hey";
	print_file(finout);

	// try app mode
	finout.clear();
	finout.close();
	finout.open("da_file",ios_base::in|ios_base::out|ios::app);
	finout<< "hey";

	print_file(finout);

	return 0;
}


void print_file(istream& file)
{
	cout<< "file.rdstate="<< file.rdstate() << endl;
	char buffer[80];
	file.seekg(0,ios::beg);
	while (file.getline(buffer,sizeof(buffer))) {
		cout<< buffer << endl;
	}
	cout << endl;
}