What is the difference between getc and fgetc

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If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email. If you find any instances of plagiarism from the community, please send an email to: info-contact alibabacloud. A comprehensive suite of global cloud computing services to power your business. The argument to GETC shocould not be an expression with side effects.

However, due to macro reasons, there may be more than one actual code. Therefore, do not use a macro expression with "Side effects ". How many times does it add itself? This is obviously different from what we want. Check the code. Related Keywords: difference between getc and getchar difference between reference and pointer difference between abstraction and inheritance difference between array and structure difference between attribute and property difference between cdt and pst difference between chop and chomp.

It is more or less the difference, though the standard doesn't require getc to be a macro. That's partly correct about your implementation , partly misleading.

Both getc and fgetc must be implemented as functions, therefore you can use the name of either in a function pointer context.

At this point, there is a subtle difference between them, that's irrelevant in most contexts: getc, if implemented as a macro, is allowed to evaluate its argument multiple times, while fgetc must evaluate it only once. This only makes a difference if fgetc is called with an expression having side effects as its arguments, which is a very exotic case never happened to me in practice. In practice, just use getc which is likely to be marginally faster, if implemented as a macro and forget about the existence of fgetc.

Just for completeness. It is only the stream argument that can be evaluated more than once. It is only the stream argument that can be. Could someone give a usage example of getc evaluating it's argument multiple times? Also, when would such a construct actually be useful? Thanks, Paul -- Paul D. Boyle bo Assume that you have N open streams in my array above and you want to get one character from each one, in turn. Personally, I'd opt for the former.

So, let's imagine an implementation that wants to make these optimizations possible. Payroll System using Nested-ifs java. Follow us! Get the Latest Bytes Updates. By using this site, you agree to our Privacy Policy and Terms of Use.

Feb 2 '09 reply rx 13, 8TB Yes, that is what wfc meant by equivalent. Feb 3 '09 reply Message. Cancel Changes. General The research path of clustering reply views Thread by goatbishop last post: by.

General A tool to try open-source projects quickly reply views Thread by Trystan last post: by. General I want to be a programmer.