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Message: [QUOTE="s0suk3, post: 3626296"] What is the advantage of using unsigned char over char? Why can it even invoke undefined behavior as vippstar said? I read somewhere that, if char happens to be signed, and if the variable will be used to hold 8-bit characters (i.e., a character whose value requires the use of the leftmost bit), it was better to use unsigned char if the variable would ever be used as an integer (otherwise we might end up with a negative value). Are there any other advantages other than that? And what's the deal with UB? Sebastian [/QUOTE]