This works similarly, but for the first digit it displays a '0'.


    This method should work on any 3-digit number.  The only thing you have to do, in addition to typing the program listed earlier, is make the printn procedure.  This procedure has the interface to the 7-seg. display.  So this procedure would have to read variable 'pn' and check to see its value.  Suppose it's a zero, then print a zero, or if it's a seven then print a seven, etc.  You will also have to write the delay procedure.  This procedure must delay long enough for the user to see the number.