these are not errors, only warnings

They are not syntax errors, so that the program will compile and continue to execute, but they are likely to be logical errors. Don't dismiss warnings unless you know very well what you are doing. They are an immense help for you, take advantage of that.

Sorry, but I down voted your last post, because I think this is the wrong reaction to the help being provided to you.

In reply to Re^3: nooby question about @+, @- by Laurent_R
in thread nooby question about @+, @- by rsFalse

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