How should I tell manager? site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. OK, I got this. The function fflush(stdin) is used to flush or clear the output buffer of the stream. and the adjustment was to 'catch' the (n-1) character just before the conditional in the while loop be evaluated, here is the code: The possible explanation is that for the while loop to break, it has to assign the value '\n' to the variable y, so it will be the last assigned value.

Please add a bit more details about how this solution works and how it is a useful way to solve the problem. If I missed something with the explanation, code A or code B please tell me, I’m barely new in c. doesn't read only the characters before the linefeed ('\n'). When enter is pressed, that signals the end of the line... but the stream contains a line feed instead since that's the normal end-of-line marker for the system. Therefore, at Line 2, it will read the \n and will not wait for the user to enter a character. It will be a great answer if the author would write implications of this method. If stdin is all ready flushed to the end-of-line, calling FlushStdin() or other posted scanf(), fgetc() solutions, will flush to the end of the next line. ishmael : All of our computers here in Cyber Command are Linux and it works fine on them.

from the comp.lang.c FAQ. The type of c must be int (or larger) in order to be able to hold the value EOF. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. What can we do? I post a little adjustment 'Code B' for anyone who maybe have the same problem. How can I flush pending input so that a user's typeahead isn't read at the next prompt?

See I'm using scanf %c to read a Y/N response, but later input gets skipped. @EvAlex: there are many issues with this. What do I do if I cannot give a good reference to my PhD student? What is the use-case where you need something other than this?

doesn't read only the characters before the linefeed ('\n'). If I missed something with the explanation, code A or code B please tell me, I’m barely new in c. Another solution not mentioned yet is to use: Could someone be convinced they are a robot? This question is about how about clearing the remaining input from stdin.

But I cannot explain myself how it works? With text-mode streams, it doesn't matter what line-endings your platform uses (whether carriage return (0x0D) + linefeed (0x0A), a bare CR, or a bare LF). the second method depends on the condition like newline,null character,EOF etc(above it was newline).

@Rajesh That would clear until the input stream is closed, which it won't be if there is more input to come later. And for interactive input it's not guaranteed to do anything. Not able to understand the location of EOF in stdin.

Is there any evidence to support the claim that English grammar is unusually straightforward? How to flush stdin without requiring user input? Does my toilet drain poorly because of bad venting? Why is Olympus Mons the largest volcano in the whole solar system? Is it too late for me to become good at piano?

Infinite loop when trying to clear the input buffer. How is it possible that we haven't discovered anything in the Oort cloud yet? It is endless loop. Can we use SEEK_SET instead? Which character to escape for this to work in ~/.bashrc.

Thanks for contributing an answer to Stack Overflow! The best solution is to not depend on the input buffer's state so much. Are there any issues? What does this mean for the future of AI, edge…, What I learned from hiring hundreds of engineers can help you land your next…, Hot Meta Posts: Allow for removal by moderators, and thoughts about future…, Goodbye, Prettify. A portable way to clear up to the end of a line that you've already tried to read partially is: int c; while ((c = getchar()) != '\n' && c != EOF) { } This reads and discards characters until it gets \n which signals the end of the file.

rev 2020.9.24.37673, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. In C and C++, we have different methods to clear the buffer discussed in this post . How does the highlight.js change affect Stack Overflow specifically? if so, in the input buffer still remains the '\n' character???

As for why it reads a linefeed instead of a carriage return, that's because the system has translated the return to a linefeed.

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