void setup()
{
  volatile char *dirf,*outf;
  volatile char *dirk,*outk;
  dirf=0x30; outf=0x31;
  dirk=0x107; outk=0x108;
  *dirf=0xFF; *dirk=0xFF;
  volatile long arr[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
  volatile long i,j,k;
  while(1)
  {
    for(i=9;i>=0;i--)
    {
      for(j=9;j>=0;j--)
      {
        *outf=arr[i]+128;// display tens digit number
        *outk=arr[j];//display ones digit number
        for(k=0;k<=300000;k++);//delay to see change
      }
    }
  }
}

void loop()
{
  
}