int digit[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0xFF,0x6F};
int num;
int butPin = 7;

void setup() {
  for(int x = 0;x < 7; x++){
    pinMode(x, OUTPUT);
  }
  randomSeed(analogRead(A0));
  num = random(4,9);
  pinMode(butPin, INPUT_PULLUP);

}


void loop() {
  int button = digitalRead(butPin);
  if(button == 0){
    num --;
    delay(400);
    if(num <= 0){
      num = 0;
    }
  }
  int k = digit[num];
  for(int x = 0;x<7;x++){
    int temp = k & 0x01;
    digitalWrite(x,temp);
    k = k >> 1;
  }


}