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You need to explicitly check ( a large switch/case statement comes to mind ) . I would create a simple parser that checks for a: "id = value eol" syntax. You check that the syntax is correct, lookup...

So the file will be like a .config or .rc file basically?

I have no idea what you want to do. If you make sure your variables are initialized you don't need to check if they are defined, you know they are. That may or may not have helped you depending on...