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.




Public Sub Main()
Dim sOutput As String = "Hello "
Dim sInput As String = File.Load(User.Home &/ "input.txt") 'Has the word 'World!' stored
 
File.Save(User.Home &/ "output.txt", sOutput)
File.Save(User.Home &/ "input.txt", sOutput & sInput)
 
Print "'input.txt' contains - " & sOutput & sInput
Print "'output.txt' contains - " & sOutput 
 
End