void setup() 
{
  volatile char *dira,*outa;
  volatile char *dirc,*outc;
  volatile char *dirf,*outf;
  volatile char *dirk,*ink;
  dirk=0x107; ink=0x106;
  dirf=0x30; outf=0x31;
  *dirf=0xF0; *dirk=0x00;
  dira=0x21; outa=0x22;
  dirc=0x27; outc=0x28;
  *dira=0xFF; *dirc=0xFF;
  volatile long i;
  volatile char x;
  volatile long arr[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
  while(1)
  {
    for(i=0;i<4;i++)
    {
      *outf=1<<i;
      x=*ink;
      if(*outf==1 && (x & 1)==1)
      {
        *outa=arr[1];
        *outc=1;
        *outc=0;
      }
      x=*ink;
      if(*outf==1 && (x & 2) ==2)
      {
        *outa=arr[2];
        *outc=1;
        *outc=0;
      }
      x=*ink;
      if(*outf==1 && (x & 4) ==4)
      {
        *outa=arr[3];
        *outc=1;
        *outc=0;
      }
    }
  }
}

void loop() {
  // put your main code here, to run repeatedly:

}