Using int for character types when comparing with EOF

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getchar result is the input character converted to unsigned char and then to int or EOF i.e. it will be in the -1 — 255 range that’s 257 different values, you can’t put that in an 8 bit char without merging two of them. Practically either you’ll mistake EOF as a valid character (that will happen if char is unsigned) or will mistake another character as EOF (that will happen if char is signed).

Note: I’m assuming an 8 bit char type, I know this assumption isn’t backed up by the standard, it is just by far the most common implementation choice.

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