int main(void)

{
DDRD &= ~(1 << 6);//第六位設置為輸入
DDRD &= ~(1 << 3);//第六位設置為輸入
DDRD &= ~(1 << 7);//第六位設置為輸入
PORTD |= (1 << 6);//打開上啦電阻
PORTD |= (1 << 7);//打開上啦電阻
DDRA |= (1 << 3);//設置為輸出
DDRB |= (1 << 0);//設置為輸出
DDRB |= (1 << 1);//設置為輸出
PORTA &= ~(1 << 3);//關蜂鳴器

while(1)
{
if(PIND & (1 << 6)) //開關打開的時候
{
PORTA &= ~(1 << 3);//關蜂鳴器
}
else
{
if(PIND & (1 << 7))
PORTB &= ~(1 << 0);//燈滅
else
PORTB |= (1 << 0);//燈開
PORTA |= (1 << 3); //開蜂鳴器
}
}

}