ESc101 Laboratory Assignment 
	        	Monday of Week of 25/10/04

Write a program to sort "n" integers stored in a file, say FileA.dat using 
Bubble Sort.  Use of arrays is not allowed. Use a second file, FileB.dat for 
the process as described below. 

In the first iteration, read from FileA.dat and write into FileB.dat.
In the second iteration read from FileB.dat and write into FileA.dat. In 
this way alternate till sorting is complete. If final result ends up in 
FileB.dat, then copy it in FileA.dat.

In each iteration first read the first number in variable "current". Now 
starting from the second number onwards, scan upto the end of the file. In 
each step compare the next number from the file and compare it with "current". 
If the next number is smaller than "current", then write it in the other file. 
Otherwise perform exchange, i.e., write the current into the other file and set 
"current" to the next number. In each iteration keep the record whether any 
exchange was performed. If not, then sorting is over.


Note that the above method should be other than "main". Then in the "main"
method call the sort method. You should use text-file so that you can create
the data-file directly.