int i,j; //i預計顯示字形0~9,j預計用於顯示何段LED pin腳位
byte num[10]={
 0xc0, //0
 0xf9, //1
 0xa4, //2
 0xb0, //3
 0x99, //4
 0x92, //5
 0x82, //6
 0xf8, //7
 0x80, //8
 0x90, //9
};
int seg[]={15,2,4,5,18,19,21,22};
const int btnPin = 12;
int count = 0;
void setup() 
{
  for(j=0;j<8;j++){
    pinMode(seg[j], OUTPUT);
    }
  pinMode(btnPin, INPUT_PULLUP);
}

void loop() 
{
  if(digitalRead(btnPin) == LOW){
  count++;
  int disNum = count % 10;
    for(j=0;j<8;j++)
    {
     if(bitRead(num[disNum],j)) //biRead讀取位元狀態
       digitalWrite(seg[j], HIGH); //共陽時HIGH不亮
     else
       digitalWrite(seg[j], LOW); //共陽時LOQW亮
    }
  delay(500);
  }
}