using System;
using System.IO;

namespace PS8_Q1
{	//
	// Problem Set 8, Question 1
	// Written by Paul Hudak
	// November 15, 2006
	//
	class Class1
	{	//
		// Program Design Exercise 18 in Chapter 11
		//
		[STAThread]
		static void Main(string[] args)
		{	
			// declare streams outside of "try" so that they can be
			//   referenced in the "finally" clause
			StreamReader f_in = null;
			StreamWriter f_out = null;

			try
			{	// open the input and output files
				f_in  = new StreamReader(args[0]);
				f_out = new StreamWriter(args[1]);

				// create one array and reuse it inside loop
				string[] sa;

				// read lines from input file, remove extra spaces,
				//   and write result to output file
				string s = f_in.ReadLine();
				while (s!=null)				// if s==null we're done
				{
					sa = s.Split();			// split line into array of words
					for (int i=0; i<sa.Length; i=i+1)
					{	// loop through words in the array
						if (sa[i]!="")		// ignore entries due to excess whitespace
							f_out.Write(sa[i] + " ");
					}
					f_out.WriteLine();		// write a newline
					s = f_in.ReadLine();	// get next line
				}
			}
			catch 
			{	// recover gracefully from I/O errors
				Console.WriteLine("File does not exist.");
			}
			finally
			{	// clean up open files, if they exist
				if (f_in!=null) f_in.Close();
				if (f_out!=null) f_out.Close();
			}
		}
	}
}