File input/output is part of Short Circuit's Console Program Basics selection.
Task

Create a file called   "output.txt",   and place in it the contents of the file   "input.txt",   via an intermediate variable.

In other words, your program will demonstrate:

   how to read from a file into a variable
   how to write a variable's contents into a file


Oneliners that skip the intermediate variable are of secondary interest — operating systems have copy commands for that.




 OPEN "INPUT.TXT" FOR INPUT AS #1
 OPEN "OUTPUT.TXT" FOR OUTPUT AS #2
 DO UNTIL EOF(1)
   LINE INPUT #1, DATA$
   PRINT #2, DATA$
 LOOP
 CLOSE #1
 CLOSE #2
 SYSTEM