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Message: [QUOTE="Ben Bacarisse, post: 5022176"] I don't know, and you seem unsure. (BTW, isspace was just an example -- the code could have used isalnum, isprint, isdigit... whatever). Why give the reader this conundrum when the simpler code is more obviously correct? If you already have a value of the right type for a function, a cast will, at the very least, puzzle some readers. If you reserve the use of isXXXX((unsigned char)c) to those cases where you don't have an int or and unsigned char, at least the puzzlement (if there is any) will be productive. [/QUOTE]