void setup() {
  /*Design a binary mask where specific bits are set to 1
  /and the others set to 0. This will define what you want
  to affect.
  */
   DDRB = 0b11111111; //set register to output
}
void loop() {
  unsigned char bitMask = 0b10000000;
  unsigned char originalValue = 0b11111111;
  DDRB = bitMask & originalValue;
  delay(1000);
}






//bit shifting formula 
//number >> n