#include <avr/io.h>    			

int main(void) 
{	
    char mynum[]= {-4,-3,-2,-1,0,+1,+2,+3,+4};
    unsigned char z;
	
	DDRB = 0xFF;    			

    for(z = 0;z <= 8; z++)
      PORTB = mynum[z];

    while(1);					

	return 0;
}