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Message: [QUOTE="Ben Bacarisse, post: 5021700"] I don't think K&R have introduced these by the time this exercise is set. No reason not to mention them, of course, but you then have to explain the (unsigned char)c cast: The OP has now posted their full code and they correctly have int c; ... ... c = getchar() ... so the cast is not needed. In fact, if they changed the code so that EOF might to be passed to a ctype function, the cast makes the code wrong! I realise you could not know that c was an int set by getchar() at the time you posted, but there was always a risk such advice could be wrong or confusing. <snip> [/QUOTE]