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Is it possible to have someone type up a text file (*.txt) so that when the program starts, it will use variables declared in the text file as real variables, or would I have to have a pre-defined set of variables?
If that's not possible, then would it be possible to have a text-file set some variables?
Yes it's possible. You could design a class to hold the variable's information like it's name and size and create a new class object each time a new variable declarion is found in the file. It wouldn't be as efficant as variables declared in the program but this is the sort of thing that makes scripting languaes less efficant then compiled programs.