Keyboard input/Flush the keyboard buffer: Difference between revisions

<lang|c>#include <stdio.h>

#include <stdlib.h>

int main(int argc, char* argv[])

{

// Get a chance to make stdin input buffer dirty.

//

char text[256];

getchar();

// This DOES NOT WORK properly on all modern systems including Linux & W10.

// Obsolete, don't use this. BTW, there is no fpurge in MSVC libs in 2020.

//

fflush(stdin);

// Always works. The only difference is (?) that readed characters may

// remain somethere in RAM.

//

fseek(stdin, 0, SEEK_END);

// BTW, a very dirty solution is below - an unbuffered stream does not need

// any flushing etc. It should be safe - i.e. if called before any I/O then

// no trace of buffered characters remain in RAM. Use with care.

//

setvbuf(stdin, NULL, _IONBF, 0);

// Now we are able to check if the buffer is really empty.

// BTW, NEVER use gets due to possible the buffer overrun.

//

fgets(text, sizeof(text), stdin);

puts(text);

return EXIT_SUCCESS;

}</lang>