#include <SevSeg.h>

SevSeg sevseg;

byte numDigits=4;
byte digitPins[]={2,3,12,13};
byte segmentPins[]={7,6,5,10,11,8,9,4};
byte hardwareConfig=COMMON_CATHODE;

int num;
int delaycount=0;

//判断素数
bool prime(int n)//判断素数
{
    if (n == 0 || n == 1)return 0;


    for (int i = 2; i * i <= n; i++)
    {

        if (n % i == 0)
            return 0;
    }
    return 1;
}




void setup() {
  sevseg.begin(hardwareConfig,numDigits,digitPins,segmentPins);
  /*num=-9;
  
  while(1)
  {
    delaycount++;
    if(delaycount==5000)
    {
      delaycount=0;
      num++;
    }
    sevseg.setNumber(num,-1);
  sevseg.refreshDisplay();
  if(num==0)break;
  }
  num=-9;
  while(1)
  {
    
    delaycount++;
    if(delaycount==5000)
    {
      delaycount=0;
      num++;
    }
    sevseg.setNumber(num,1);
  sevseg.refreshDisplay();
  if(num==0)break;
  }*/
  num=0;
  int leds[8] = {7,6,5,10,11,8,9,4};
      
  while(1)
  {
   
   
    if(prime(num)){
    delaycount++;
    if(delaycount==5000)
    {
      delaycount=0;
      
    }
    sevseg.setNumber(num,-1);
  sevseg.refreshDisplay();
  
    else{
       delaycount++;
    if(delaycount==5000)
    {
      delaycount=0;
      num++;
    }
    sevseg.setNumber(num,-1);
  sevseg.refreshDisplay();
    }
  if(num==21)break; 
  }

}

void loop() {}