/* Lecture code 1.0
 *
 * Code to read in a file containing a mix of integers and
 * plain-text strings, then output only the strings.  This
 * leverages heavily off of stream failure and is a great way
 * to see how streams work in practice.
 *
 * To run this program, you'll need to have a file named
 * datafile.dat in the working directory.
 */
 
 #include <iostream>
 #include <fstream> // For ifstream
 #include <string>
 using namespace std;
 
int main()
{
	/* Open the file.  In the version we used in class,
	 * we did not check that the file was actually open,
	 * but in practice we would do some checking.  I've
	 * put a sample error handler here.
	 */
	ifstream input("datafile.dat");
	if(!input.is_open())
	{
		/* cerr is the error-logging output stream,
		 * which prints to the console.
		 */
		cerr << "Cannot open file!" << endl;
		return 0;
	}
	
	while(true)
	{
		/* Try to read an int. */
		int myInt;
		input >> myInt;
		
		/* Check for end-of-file, break if necessary. */
		if(input.eof())
			break;
		
		/* If we fail, read it as a string. */
		if(input.fail())
		{
			input.clear(); // Very important!
			string word;
			input >> word;
			cout << word << " ";
		}
	}
	
	return 0;
}