using variables in file names

[Lurie, Nicholas]

Is there anyway to create a file using a variable?

Suppose I have a variable called sub and I want to save text to a file named
sub.txt where sub is a number from 1 to 100.

Normally, I would write

open file "sub.txt"
put results & cr into file "sub.txt" at eof
close file "sub.txt"

How can I change the filename based on the current value of sub?

Thanks!
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