A+++ would read again! The one I like moves the stream pointer for the keyboard - very elegant, but everybody asks WTF is THAT? We equally welcome both specific questions as well as open-ended discussions. For C I/O in a line oriented text milieu, fgets() is fine: returns null on error or EOF, is supported by ferror(), perror(), feof() (not necessary, as if a null return is not an error, it is EOF).
Here is a piece of c code that I wrote after testing some stuffs. … Now, if stdin is a pipe or such, a read() too big will stall, so many apps read() one byte at a time to get earlier access to input. It's tied heavily to fgets, requires a special buffer that can easily cause name conflicts, lacks flexibility in where it can be called, and ignores error handling. Instead of calling characters beyond the length of your buffer "junk" and throwing them away, robust code will at best allow them somehow and at worst gracefully refrain from actively deleting data. the intended use is in conjunction with fgets. Please find below the description and … too many new and intermediate users of C attempt to use the command fflush(stdin) to "flush the input buffer".

this is patently wrong. There are three types of streams stdin (standard input), stderr (standard error), stdout (standard output). We're a friendly, industry-focused community of That is a fantastic solution, you are my hero :))). fflush(stdin) invokes undefined behavior because the standard says so. the rule is (and click if you don't believe me) : NEVER USE "FFLUSH()" ON INPUT STREAMS SUCH AS "STDIN" How you handle that is policy: ignore, error out or realloc() a bigger buffer and fgets() on top of the trailing null byte for additional space plus 1. here is one method of properly flushing extra (and unwanted) characters from the stdin input stream. About; Products For Teams; Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with … I have read most of the answers for this question, and they all say its to clear the input stream.

I know this is not a vulnerability concern, but I don't understand why the stdin is not flushed after the normal return of the pro... Stack Overflow. It's inefficient in general, and most importantly, neglects that the newline handling of fgets is there for a reason. If you argue which operations are valid on the basis of which ones make sense, no two people are going to get the same answer; one person POSIX extends the specification of fflush by defining its effects on an input stream, as long as that stream represents a file or another seekable device: in that case the POSIX file pointer is repositioned to match the C stream pointer (which effectively undoes any read buffering) and the effects of any std::ungetc or std::ungetwc that weren't yet read back from …
Its purpose is to clear (or flush) the output buffer and move the buffered data to console (in case of stdout) or disk (in case of file output stream). To them I say, start reading the C standard before giving out such answers.

fflush() function is used to flush the buffer after each iteration in the program. 1.19 million developers, IT pros, digital marketers, and technology enthusiasts learning and sharing knowledge. fflush() is typically used for output stream only. the macro will also ensure the newline character is stripped. Alasan hal ini dapat terjadi karena nilai string telah disimpan pada buffer, artinya nilai stream belum dibersihkan dengan benar seperti yang diharapkan pada nilai string beserta spasi atau baris baru.

too many new and intermediate users of C attempt to use the command [icode]fflush(stdin)[/icode] to "flush the input buffer". the code is written as a macro, and requires a character array to collect excess (junk) input. The only caveat is that you need a long line detection, which can simply be that if the last byte of your buffer is set to null and the prior byte is not a linefeed, your buffer was too short for the line, and you have just the first part of the line. for example: wow, dude, this snippet rocks! Eh, I'm not a fan of it. Reach out to all the awesome people in our software development community by starting your own topic. fflush() function is a file handling function in C programming language which is used to flush/clean the file or buffer. Undefined behavior. Input: geeks geeksforgeeks Output: geeks geeks Kode program sebelumnya hanya memberikan input tunggal dan mengembalikan nilai sama untuk input kedua.