int button=2;
int buttonstate;
int rnd;
int A = 10;
int B = 3;
int C = 4;
int D = 5;
int E = 6;
int F = 7;
int G = 8;
int DP =9;
int num;

void setup() {
  pinMode(button, INPUT);
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);
  Serial.begin(9600);
  randomSeed(analogRead(0));

}

void loop() {
buttonstate=digitalRead(button);

  Serial.print("digit is: ");
  Serial.println(num);
  delay(100);
  if(buttonstate==HIGH){
   rnd=random(0,9);
    num=rnd;
    if(num<=9){
      Serial.println("digit displayed: ");
      Serial.print(num);
      delay(10000);
      switch(num) {
        case 0:
        digitalWrite(A, HIGH);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, HIGH);
        digitalWrite(E, HIGH);
        digitalWrite(F, HIGH);
        digitalWrite(G, LOW);
      break;
      case 1:
        digitalWrite(A, LOW);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, LOW);
        digitalWrite(E, LOW);
        digitalWrite(F, LOW);
        digitalWrite(G, LOW);
      break;
      case 2:
        digitalWrite(A, HIGH);
        digitalWrite(B, HIGH);
        digitalWrite(C, LOW);
        digitalWrite(D, HIGH);
        digitalWrite(E, HIGH);
        digitalWrite(F, LOW);
        digitalWrite(G, HIGH);
      break;
      case 3:
        digitalWrite(A, HIGH);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, HIGH);
        digitalWrite(E, LOW);
        digitalWrite(F, LOW);
        digitalWrite(G, HIGH);
      break;
      case 4:
        digitalWrite(A, LOW);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, LOW);
        digitalWrite(E, LOW);
        digitalWrite(F, HIGH);
        digitalWrite(G, HIGH);
      break;
      case 5:
        digitalWrite(A, HIGH);
        digitalWrite(B, LOW);
        digitalWrite(C, HIGH);
        digitalWrite(D, HIGH);
        digitalWrite(E, LOW);
        digitalWrite(F, HIGH);
        digitalWrite(G, HIGH);
      break;
      case 6:
        digitalWrite(A, HIGH);
        digitalWrite(B, LOW);
        digitalWrite(C, HIGH);
        digitalWrite(D, HIGH);
        digitalWrite(E, HIGH);
        digitalWrite(F, HIGH);
        digitalWrite(G, HIGH);
      break;
      case 7:
        digitalWrite(A, HIGH);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, LOW);
        digitalWrite(E, LOW);
        digitalWrite(F, LOW);
        digitalWrite(G, LOW);
      break;
      case 8:
        digitalWrite(A, HIGH);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, HIGH);
        digitalWrite(E, HIGH);
        digitalWrite(F, HIGH);
        digitalWrite(G, HIGH);
      break;
      case 9:
        digitalWrite(A, HIGH);
        digitalWrite(B, HIGH);
        digitalWrite(C, HIGH);
        digitalWrite(D, HIGH);
        digitalWrite(E, LOW);
        digitalWrite(F, HIGH);
        digitalWrite(G, HIGH);
      break;
      default:
        digitalWrite(A, LOW);
        digitalWrite(B, LOW);
        digitalWrite(C, LOW);
        digitalWrite(D, LOW);
        digitalWrite(E, LOW);
        digitalWrite(F, LOW);
        digitalWrite(G, HIGH);
      break;
      delay(5000);

      }
    }
  }
  }