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Message: [QUOTE="Tim Rentsch, post: 3952470"] It guards against accidentally forgetting the calling requirements of the isXXX functions, which specify taking a character argument that's been converted to (unsigned char) (and perhaps thence to (int), but that's done automatically by the calling conversions). Any (char) is representable as an (unsigned char). A disadvantage of the above is that it might do the wrong thing with an EOF value. But there's no absolutely foolproof way out of that dilemma. [/QUOTE]