void setup()
{
  volatile char *dirf,*outf;
  volatile char *dirk,*ink;
  dirf=0x30; outf=0x31;
  dirk=0x107; ink=0x106;
  *dirf=0xFF; *ink=0x00;
  volatile char switches;
  volatile long arr1[]={63,6,91,79,102,109,125,7,127};
  volatile long i,j,k;
  while(1)
  {
    switches=*ink;// taking input from switch
    if((switches & 64) == 64)
    {
      for(i=0;i<=8;i++)
      {
        *outf=arr1[i];// to display from 0 to 8
        for(j=0;j<=200000;j++); //delay
      }
      *outf=0;
      for(j=0;j<=200000;j++); // off the display
      for(k=8;k>=0;k--) //delay
      {
        *outf=arr1[k]; // to display from 8 to 0
        for(j=0;j<=200000;j++);// delay
      }
    }
    else *outf=0;
  }
}

void loop()
{

}