I am not able to flush stdin. How can I flush stdin in C?
c, fflush, stdin
Solution
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 stdin would probably be something along the lines of the following:
int c;
while ((c = getchar()) != '\n' && c != EOF);
Problem
How to flush the stdin?? Why is it not working in the following code snippet? ``` #include <string.h> #include <stdio.h> #include <malloc.h> #include <fcntl.h> int main() { int i = 0, j = 0, sat; char arg[256]; char *argq; argq = malloc(sizeof(char) * 10); printf("Input the line\n"); i = read(0, arg, sizeof(char) * 9); arg[i - 1] = '\0'; fflush(stdin); i = read(0, argq, sizeof(char) * 5); argq[i - 1] = '\0'; puts(arg); puts(argq); return 0; } ``` Now if I give the input as 11 characters, only 9 should be read but the remaining two characters in the stdin are not flushed and read again in the argq. Why? Input: `123 456 789` Output: ``` 123 456 89 ``` Why am I getting this `89` as the output?