while (getchar () != '\n' );

Question

I have the following for loop, I am prompting the user to enter a 4 digit pin and hit enter. Can someone explain to me what the while loop is really doing because I don\'t f

Answer 1

The next line is discarding the possible extra chars that the user may have inputted, and also the linefeed char that the user had to input.

So other scanf/getchar methods further in the code are not polluted by this spurious input.