/*
   ECE 264
   Yung-Hsiang Lu, Purdue
   Spring 2009
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
char * findWord(char * str, int nthword)
{
  /* find the n-th word in str */
  /* If str has so many words, return a pointer. */
  /* If str does not have so many words, return 0. */
  /* consider to use strchr */
  return str;
}

int compareString(/* arguments */)
{
  /* find the n-th words in str1 and str2 and compare them */
  return 1;
}

void sortString(/* 
		   arguments: the lines,
		   how many lines, and which 
		   word is used for comparison
		*/)
{
  /* replace integer comparison by string comparison */
  /* swap the strings, if necessary */
}

void printString(/*
		   arguments: the lines and how many lines
		 */)
{
  printf("\n");
}

int main(int argc, char * argv[])
{
  /* check the input arguments */
  /* open input file */
  /* read the file line by line (at most 60 characters 
     per line, ignore the rest if the line is longer) */
  /* sort the lines based on the n-th words */
  /* print result */
  /* release memory, if necessary */
  return 0;
}