char digit[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x7,0x7F,0x6F};
int buttonR = 9;
int buttonG = 8;
int rnd;
int j;
int i;

void setup() {
  for(int x = 0; x < 7; x++){
    pinMode(x, OUTPUT);
  }
  pinMode(buttonR, INPUT_PULLUP);
  pinMode(buttonG, INPUT_PULLUP);
  randomSeed(analogRead(A0));
  rnd = random(1,10);
  j = 0;
}

void loop() {
  if(digitalRead(buttonR) == LOW){
    if(j > 0){
      j--;
      delay(200);
    }
  }
  if(digitalRead(buttonG)== LOW){
    if(j < 9){
      j++;
      delay(200);
    }
  }
  i = digit[j];
  if(j == rnd){
    i = 0b01110111;
  }
  for(int x = 0; x < 7; x++){
    int temp = i & 0x01;
    digitalWrite(x, temp);
    i = i >> 1;
  }
}