display random number on 7 segment display

//Arduino 4fun project with cathode 7 segment display
//code by Bagus Santoso

int button = 2;
int butVal;
int randVal;

int pinNumb[7] = {3,4,5,6,7,8,9};
bool pressVal;

void setup()
{
  Serial.begin(9600);

  for(int i = 0; i < 7 ; i++)
  {
    pinMode(pinNumb[i],OUTPUT);
  }
  pressVal = false;
  pinMode(button, INPUT);
}

void loop()
{

  butVal = digitalRead(button);

  if(butVal == 0)
  {
    //zero();
    turnOff();
    pressVal = false;
  }
  else
  {
     //zero();
     if(pressVal == false)
     {
      randVal = rand() % 10;
      pressVal = true;
     }

     Serial.println(randVal);

     if(randVal == 0)
     {
      zero();
     }
     else if(randVal == 1)
     {
      one();
     }
     else if(randVal == 2)
     {
      two();
     }
     else if(randVal == 3)
     {
      three();
     }
     else if(randVal == 4)
     {
      four();
     }
     else if(randVal == 5)
     {
      five();
     }
     else if(randVal == 6)
     {
      six();
     }
     else if(randVal == 7)
     {
      seven();
     }
     else if(randVal == 8)
     {
      eight();
     }
     else
     {
      nine();
     }
  }
}

void zero()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],HIGH);
  }

  digitalWrite(pinNumb[6],LOW);
}

void one()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[1],HIGH);
  digitalWrite(pinNumb[2],HIGH);
}

void two()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[0],HIGH);
  digitalWrite(pinNumb[1],HIGH);
  digitalWrite(pinNumb[6],HIGH);
  digitalWrite(pinNumb[4],HIGH);
  digitalWrite(pinNumb[3],HIGH);
}

void three()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[0],HIGH);
  digitalWrite(pinNumb[1],HIGH);
  digitalWrite(pinNumb[6],HIGH);
  digitalWrite(pinNumb[2],HIGH);
  digitalWrite(pinNumb[3],HIGH);
}

void four()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[1],HIGH);
  digitalWrite(pinNumb[2],HIGH);
  digitalWrite(pinNumb[5],HIGH);
  digitalWrite(pinNumb[6],HIGH);
}

void five()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[0],HIGH);
  digitalWrite(pinNumb[2],HIGH);
  digitalWrite(pinNumb[3],HIGH);
  digitalWrite(pinNumb[5],HIGH);
  digitalWrite(pinNumb[6],HIGH);
}

void six()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[0],HIGH);
  digitalWrite(pinNumb[2],HIGH);
  digitalWrite(pinNumb[3],HIGH);
  digitalWrite(pinNumb[4],HIGH);
  digitalWrite(pinNumb[5],HIGH);
  digitalWrite(pinNumb[6],HIGH);
}

void seven()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[0],HIGH);
  digitalWrite(pinNumb[1],HIGH);
  digitalWrite(pinNumb[2],HIGH);
}

void eight()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],HIGH);
  }


}

void nine()
{

  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }

  digitalWrite(pinNumb[0],HIGH);
  digitalWrite(pinNumb[1],HIGH);
  digitalWrite(pinNumb[2],HIGH);
  digitalWrite(pinNumb[3],HIGH);
  digitalWrite(pinNumb[5],HIGH);
  digitalWrite(pinNumb[6],HIGH);
  digitalWrite(pinNumb[7],HIGH);
}

void turnOff()
{
  for(int i = 0; i < 7 ; i++)
  {
    digitalWrite(pinNumb[i],LOW);
  }
}