#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;
  }