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 arr[]={63,6,91,79,102,109,125,7,127,111};
  volatile long i,j,k,stopbit=1;
 loop: while(1)
  {
    if(stopbit==0) // to stop display
    {
      *outf=0;// turn on off display
      break;
    }
      *outf=arr[0];// first display zero
      switches=*ink;
      if((switches & 1) == 1)
      {
        for(volatile long n=0;n<=50000;n++);//delay for debuncing
        while(1)
        {
           for(j=0;j<=9;j++)
          {
            switches=*ink;
            if((switches & 2) == 2)//to stop the display
            {
              stopbit=0;
              for(volatile long n=0;n<=50000;n++);
              goto loop;
            }
           *outf=arr[j];// to display the numbers
           for(k=0;k<=200000;k++);// delay
          }
        }
      }
  }
}

void loop()
{

}