Well, this piece of code int c; while ((c = getchar()) != EOF && c != ‘\n’); is used to clear the buffer, as mentioned in @napnac’s answer. It is mainly used instead of fflush (stdin);, which is UB. But note that this is successful only if the input buffer happens to contain data ending … Read more
A couple of things could be causing that % sign to appear: Your program outputs k without a new line, and your shell prompt just looks like this: % Meaning that you run the program like so: % ./a.out k //getchar k% //putchar + exit + shell prompt So in short: the % isn’t part … Read more
Look at the below code you mentioned int main(void){ int c; c = getchar(); while (c != EOF) { putchar(c); } return 0; } When c = getchar(); executes & if you provided input as ABC at runtime & press ENTER(\n), that time c holds first character A. Next come to loop, your condition is … Read more