If flushing std doesn’t work, then try reading in the extra characters and discarding, as suggested here. This will work: #include <string.h> #include <stdio.h> int main(){ char nombre[10]; char mensaje[80]; int c; printf(“Type your name:\n”); scanf(“%9s”, nombre); while((c= getchar()) != ‘\n’ && c != EOF) /* discard */ ; printf(“Now, type a message:\n”); gets(mensaje); printf(“%s:%s”,nombre,mensaje); … Read more
fflush() works on FILE*, it just flushes the internal buffers in the FILE* of your application out to the OS. fsync works on a lower level, it tells the OS to flush its buffers to the physical media. OSs heavily cache data you write to a file. If the OS enforced every write to hit … Read more
The fflush function does not flush data out of an input stream; it is instead used to push data buffered in an output stream to the destination. This is documented here. As seen in this earlier SO question, trying to use fflush(stdin) leads to undefined behavior, so it’s best to avoid it. If you want … Read more
Flushing the output buffers: printf(“Buffered, will be flushed”); fflush(stdout); // Prints to screen or whatever your standard out is or fprintf(fd, “Buffered, will be flushed”); fflush(fd); //Prints to a file Can be a very helpful technique. Why would you want to flush an output buffer? Usually when I do it, it’s because the code is … Read more
In no some magical way. First of all, fflush(stdin); invokes undefined behavior. Don’t use that. Quoting C11, chapter ยง7.21.5.2, The fflush function (emphasis mine) If stream points to an output stream or an update stream in which the most recent operation was not input, the fflush function causes any unwritten data for that stream to … Read more
I believe fflush is only used with output streams. You might try fpurge or __fpurge on Linux. Note that fpurge is nonstandard and not portable. It may not be available to you. From a Linux fpurge man page: Usually it is a mistake to want to discard input buffers. The most portable solution for flushing … Read more
Simple: this is undefined behavior, since fflush is meant to be called on an output stream. This is an excerpt from the C standard: int fflush(FILE *ostream); ostream points to an output stream or an update stream in which the most recent operation was not input, the fflush function causes any unwritten data for that … Read more