int segmentA = 2;
int segmentB = 3;
int segmentC = 4;
int segmentD = 5;
int segmentE = 6;
int segmentF = 7;
int segmentG = 8;
int segmentdp = 9;
int buttonPin = 12;
int buttonState = 0;
int number;
int countdown;

void setup() {
  Serial.begin(9600);
  pinMode(segmentA, OUTPUT);
  pinMode(segmentB, OUTPUT);
  pinMode(segmentC, OUTPUT);
  pinMode(segmentD, OUTPUT);
  pinMode(segmentE, OUTPUT);
  pinMode(segmentF, OUTPUT);
  pinMode(segmentG, OUTPUT);
  pinMode(segmentdp, OUTPUT);
  pinMode(buttonPin, INPUT);
  randomSeed(analogRead(0));
}

void loop() {
  if (buttonState == HIGH) {
    countdown = 5;
    number = random(9);
  }else{
   while (countdown > 0) {
    countdown - 1;
    delay (1000);
   }
   if (countdown == 0) {
    switch (number) {
      case 0:
        digitalWrite(segmentA, 1);
        digitalWrite(segmentB, 1);
        digitalWrite(segmentC, 1);
        digitalWrite(segmentD, 1);
        digitalWrite(segmentE, 1);
        digitalWrite(segmentF, 1);
        digitalWrite(segmentG, 0);
        digitalWrite(segmentdp, 1);
      break;
      case 1:
        digitalWrite(segmentA, 0);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, 0);
        digitalWrite(segmentE, 0);
        digitalWrite(segmentF, 0);
        digitalWrite(segmentG, 0);
        digitalWrite(segmentdp, 1);
      break;
      case 2:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, 0);
        digitalWrite(segmentD, HIGH);
        digitalWrite(segmentE, HIGH);
        digitalWrite(segmentF, 0);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
      case 3:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, HIGH);
        digitalWrite(segmentE, LOW);
        digitalWrite(segmentF, LOW);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
      case 4:
        digitalWrite(segmentA, LOW);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, LOW);
        digitalWrite(segmentE, LOW);
        digitalWrite(segmentF, HIGH);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
      case 5:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, LOW);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, HIGH);
        digitalWrite(segmentE, LOW);
        digitalWrite(segmentF, HIGH);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
      case 6:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, LOW);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, HIGH);
        digitalWrite(segmentE, HIGH);
        digitalWrite(segmentF, HIGH);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
      case 7:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, LOW);
        digitalWrite(segmentE, LOW);
        digitalWrite(segmentF, LOW);
        digitalWrite(segmentG, LOW);
        digitalWrite(segmentdp, 1);
      break;
      case 8:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, HIGH);
        digitalWrite(segmentE, HIGH);
        digitalWrite(segmentF, HIGH);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
      case 9:
        digitalWrite(segmentA, HIGH);
        digitalWrite(segmentB, HIGH);
        digitalWrite(segmentC, HIGH);
        digitalWrite(segmentD, HIGH);
        digitalWrite(segmentE, LOW);
        digitalWrite(segmentF, HIGH);
        digitalWrite(segmentG, HIGH);
        digitalWrite(segmentdp, 1);
      break;
    }
   }else{

    digitalWrite(segmentA, HIGH);
    delay (100);
    digitalWrite(segmentA, LOW);
    digitalWrite(segmentB, HIGH);
    delay(100);
    digitalWrite(segmentB, LOW);
    digitalWrite(segmentC, HIGH);
    delay(100);
    digitalWrite(segmentC, LOW);
    digitalWrite(segmentD, HIGH);
    delay(100);
    digitalWrite(segmentD, LOW);
    digitalWrite(segmentE, HIGH);
    delay(100);
    digitalWrite(segmentE, LOW);
    digitalWrite(segmentF, HIGH);
    delay(100);
   }
  }
}