void delay1(void);
void setup() {
  volatile char *dirf, *outf, *dirk,*outk,*dira,*outa,*dirc,*outc;
  dirf = 0x30; dirk = 0x107; dira = 0x21; dirc = 0x27; *dirf = 0xFF; *dirk = 0xFF; *dira = 0xFF; *dirc = 0xFF;
  outf = 0x31; outk =  0x108; outa = 0x22; outc = 0x28;
  unsigned char digit[] = {0x3F,0x06,0x5B,0x4f,0x66,0x6d,0x7d,0x07,0x7F,0x6F};
  int num;
  char d1,d2,d3,d4;
  while(1){
    for(num=0;num<10000;num++){
      d1 = (char) (num/1000);
      d2 = (char) ((num/100)%10);
      d3 = (char) ((num/10)%10);
      d4 = (char) (num%10);
      if(num>=0 && num<10){
        *outf = *outk = *outa = 0x00;
        *outc = digit[d4];
      }else if(num>=10 && num<100){
        *outf = *outk = 0x00;
        *outa = digit[d3];
        *outc = digit[d4];
      }else if(num>=100 && num<1000){
        *outf = 0x00;
        *outk = digit[d2];
        *outa = digit[d3];
        *outc = digit[d4];
      }else{
        *outf = digit[d1];
        *outk = digit[d2];
        *outa = digit[d3];
        *outc = digit[d4];
      }
      delay1();
    }
  }
}
void delay1(void){
  volatile long i;
  for(i=0;i<20000;i++);
}