void setup() {
  // put your setup code here, to run once:
  volatile char *dir=0x30;
  *dir=0xFF;
  dir=0x107;
  *dir=0xFF;

}

void loop() {
  // put your main code here, to run repeatedly:
  
  
  volatile char *out_one_digit=0x31;
  volatile char *out_ten_digit=0x108;
  volatile char number[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67};//without dot
  volatile char number_dot[]={0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xE7};//with dot
  volatile long i,count,tens_count,prime=1,j,ones_digit,tens_digit;
  for(i=11;i<100;i++){
    for(j=2;j<i;j++){
      if(i%j!=0){
        prime=1;
      }
      else{
        prime=0;
        break;
      }
    }
    if(prime){
      ones_digit=i%10;
      tens_digit=i/10;
      *out_ten_digit=number[tens_digit];
      *out_one_digit=number[ones_digit];
      for(count=0;count<100000;count++);
    }
    *out_ten_digit=0;
    *out_one_digit=0;
    for(count=0;count<10000;count++);
  }

  /*for(tens_count=0;tens_count<=9;tens_count++){
    *out_ten_digit=number_dot[tens_count];
    for(count=0;count<=9;count++){
      *out_one_digit=number[count];
      for(i=0;i<100000;i++);
    }    
    //*out_ten_digit=number[tens_count];
    //for(i=0;i<10000;i++);
    //*out_one_digit=0;
    //*out_ten_digit=0;
    //for(i=0;i<200000;i++);
  }*/
  
  

}