#include <avr/io.h>



int main(void) {
  DDRB &= ~(1 << DDB0);  //Configures B0 as input
 PORTB |= _BV(PORTB0); //Enables the pull-up resistor which prevents the pin from being in a floating state
 DDRB |= (1 << DDB2);  //Configures B2 as output


  while (1) {
    static byte isOn = 0;

    if ((PINB & (1 << PINB0)) == 0) {  /* Since we have used a pull-up resistor, the reading will be '1' when the button is not pressed, and '0' when it is */

      delay(100);

      if ((PINB & (1 << PINB0)) == 0) { //'Debouncing' - we want to ensure that the button has actually been pushed for a certain amount of time (100 ms in this case).
        isOn = !isOn;

        if (isOn) {
          PORTB |= (1 << PORTB2);   //Turn on B2

        } else {
          PORTB &= ~(1 << PORTB2);


        }
      }
      while ((PINB & (1 << PINB0)) == 0);  //Do nothing as long as button is pressed

    }
  }
}