void digital_show(int num)
{
if(num<0) num=0;
if(num>9) num=9;

for(int i=4;i<=11;i++)
digitalWrite(i, LOW);
switch(num)
{
  case 0:
  digitalWrite(PA, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PC, HIGH);
  digitalWrite(PD, HIGH);
  digitalWrite(PE, HIGH);
  digitalWrite(PF, HIGH);
  break;
  case 1:
  digitalWrite(PB, HIGH);
  digitalWrite(PC, HIGH);
  break;
  case 2:
   digitalWrite(PA, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PD, HIGH);
  digitalWrite(PE, HIGH);
  digitalWrite(PG, HIGH);
  break;
case 3:
   digitalWrite(PA, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PC, HIGH);
  digitalWrite(PD, HIGH);
  digitalWrite(PG, HIGH);
  break;
  case 4:
   digitalWrite(PC, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PF, HIGH);
  digitalWrite(PG, HIGH);
  break;
  case 5:
   digitalWrite(PA, HIGH);
  digitalWrite(PC, HIGH);
  digitalWrite(PD, HIGH);
  digitalWrite(PF, HIGH);
  digitalWrite(PG, HIGH);
  break;

case 6:
   digitalWrite(PA, HIGH);
  digitalWrite(PC, HIGH);
  digitalWrite(PD, HIGH);
   digitalWrite(PE, HIGH);
  digitalWrite(PF, HIGH);
  digitalWrite(PG, HIGH);
  break;
  case 7:
   digitalWrite(PA, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PC, HIGH);
  break;
  case 8:
   digitalWrite(PA, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PC, HIGH);
  digitalWrite(PD, HIGH);
  digitalWrite(PE, HIGH);
  digitalWrite(PF, HIGH);
  digitalWrite(PG, HIGH);
  break;
case 9:
   digitalWrite(PA, HIGH);
  digitalWrite(PB, HIGH);
  digitalWrite(PC, HIGH);
  digitalWrite(PD, HIGH);
  digitalWrite(PF, HIGH);
  digitalWrite(PG, HIGH);
  break;

}

}
int pflag=0;
int buttonState=0;
void setup() {
  for(int i=4;i<=11;i++)
     pinMode(i, OUTPUT);
     pinMode(2, INPUT);//设置为输入引脚
     Serial.begin(9600);
}

void loop() 
{
Serial.print(".");
buttonState=digitalRead(2);
if(buttonState==HIGH)//按键按下
{
  delay(10);
  buttonState=digitalRead(2);
  if(buttonState==HIGH)//按键按下
  {
   delay(10);
   buttonState=digitalRead(2);
    if(buttonState==HIGH)//按键按下
  {
  pflag=1+pflag;
  Serial.print(pflag);
  }
}
for(int i=4;i<=11;i++)
if(pflag==1){
  digitalWrite(i,HIGH);
}
else{
  digitalWrite(i,LOW);
}
digital_show(pflag);
delay(100);
}
}