Reading/writing text files.

io.cpp

#include <iostream>
#include <fstream>
#include <string>

void w();
void r();

using namespace std;
int main()
{
  w();
	r();

	return 0;
}

void w()
{
	ofstream outf("sample.txt");

	if (!outf)
	{
		cerr << "uh oh, sample.txt couldn't be opened for writing!" << endl;
		exit(1);
	}

	// write two lines into the file
	outf << "line 1: swag" << endl;
	outf << "line 2: swag" << endl;

}

void r()
{
	ifstream inf("sample.txt");

	if (!inf)
	{
		cerr << "uh oh, sample.txt couldn't be opened for reading!" << endl;
		exit(1);
	}

	while (inf)
	{
		string strinput;
		inf >> strinput;
		cout << strinput << endl;
	}
}