Example 1

#include <conio.h>
#include <stdio.h>

int main(void)
{
   int c;
   int extended = 0;
   c = getch();

   if (!c)
   {
       extended = getch();
   }

   if (extended)
   {
       printf("The character is extended\n");
   }

   else
   {
       printf("The character isn't extended\n");
   }

   return 0;
}