How to clear input buffer in C?

Question

I have the following program:

int main(int argc, char *argv[])
{
  char ch1, ch2;
  printf(\"Input the first character:\"); // Line 1
  scanf(\"%c\", &ch         


        

Answer 1

unsigned char a=0;
if(kbhit()){
    a=getch();
    while(kbhit())
        getch();
}
cout<(a) & 0xFF)<

-or-

use maybe use _getch_nolock() ..???