Atmega16/32 Basic LED Push Button

gistfile1.txt

#include <avr/io.h>
#include <util/delay.h>

int main(void){
   DDRB |= 1 << PINB0;; //set pin0 as output
   DDRB &= ~(1 << PINB1); // set pin1 input
   PORTB |= 1 << PINB0;
   while(1){
       // check if PB1 is clear or GND then turn on the led else turn it off
       if(bit_is_clear(PINB,1)){
		  PORTB = 0b00000001;
	   }else{
	      PORTB = 0b00000000;
	   }
   }
}