void setup() {
  // put your setup code here, to run once:
  volatile char *dirf=0x30,*dirk=0x107,*dirc=0x27,*dira=0x21;
  *dirf=0xff;
  *dirk=0xff;
  *dirc=0xff;
  *dira=0xff;
}
void loop() {
  // put your main code here, to run repeatedly:
  volatile short n;
  for(n=0;n<10000;n++)
  {
    display(n);
  }
}
void display(short n) {
  // put your main code here, to run repeatedly:
 volatile char num[10]={0x3f,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0X6F};
  volatile char alph[26]={0x77,0x7c,0x39,0x5e,0x79,0x71,0x7d,0x76,0x06,0x1e,0x38,0x54,0x5c,0x73,0x67,0x50,0x6d,0x78,0x3e,0x6e,0x5b};
  //volatile char s[9]={0,1,2,4,8,16,32,64,128};
 volatile char i,j,k,dp=0x80,t=0,s;
  volatile short n;;
volatile long l;
volatile char *out[4]={
  (volatile char *)0x22,     // 1's    display  0
  (volatile char *)0x28,     // 10's   display  1
  (volatile char *)0x108,    // 100's  display  2
  (volatile char *)0x31};    // 1000's display  3
  volatile char digit[4];

for(i=0;i<4;i++)
{
s=n%10;
digit[i]=num[s];
n/=10;
}
for(i=0;i<4;i++){
*out[i]=digit[i];
//for(l=1;l<600000;l++);
}
}