//Devesh S Nair (LED On/Off)
#include <avr/io.h>

void init_io()
{
 DDRA |= 1<<PA7; //Setting the pin as output
 DDRA &= ~(1<<PA2); //Setting the pin as input
}
int is_button_pressed()
{
 return (PINA
 &(1<<PA2)) ;
}
void toggle_led()
{
 PORTA ^= 1<<PA7;
}

int main()
{
 init_io();

 while(1){
  if(is_button_pressed())
   toggle_led();
 }
 return 0;
}