/* 

found this online in a nonworking state 
fixed it for fun.

press the button to display a random number
between 0 and 9 for 1 second

if the button is held down then the number will be held 
until it is released

*/


int rnd;        // random number is stored here



void setup() {
  // put your setup code here, to run once:
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, INPUT_PULLUP);
randomSeed(analogRead(0));


}


void loop() 
{
  // put your main code here, to run repeatedly:
  if (digitalRead (9)==HIGH)
  {
    null();
  }  
  else
  {
  rnd=random(9);
  switch (rnd)
  {
    case 1:
      one();
    break;
    case 2:
      two();
    break;
    case 3:
      three();
    break;
    case 4:
      four();
    break;
    case 5:
      five();
    break;
    case 6:
      six();
    break;
    case 7:
      seven();
    break;
    case 8:
      eight();
    break;
    case 9:
      nine();
    break;
    default:
      zero();
    break;  
    }
    delay (1000);
  }
  
  while (digitalRead (9)==LOW) // wait for button release
  {
  }
  delay(5);                  // switch debounce delay
  

}  



void zero(){
digitalWrite (2, HIGH);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, HIGH);
digitalWrite (6, HIGH);
digitalWrite (7, HIGH);
digitalWrite (8, LOW);
}
void one(){
digitalWrite (2, LOW);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, LOW);
digitalWrite (6, LOW);
digitalWrite (7, LOW);
digitalWrite (8, LOW);
}
void two(){
digitalWrite (2, HIGH);
digitalWrite (3, HIGH);
digitalWrite (4, LOW);
digitalWrite (5, HIGH);
digitalWrite (6, HIGH);
digitalWrite (7, LOW);
digitalWrite (8, HIGH);
}
void three(){
digitalWrite (2, HIGH);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, HIGH);
digitalWrite (6, LOW);
digitalWrite (7, LOW);
digitalWrite (8, HIGH);
}
void four(){
digitalWrite (2, LOW);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, LOW);
digitalWrite (6, LOW);
digitalWrite (7, HIGH);
digitalWrite (8, HIGH);
}
void five(){
digitalWrite (2, HIGH);
digitalWrite (3, LOW);
digitalWrite (4, HIGH);
digitalWrite (5, HIGH);
digitalWrite (6, LOW);
digitalWrite (7,HIGH);
digitalWrite (8, HIGH);
}
void six(){
digitalWrite (2, HIGH);
digitalWrite (3, LOW);
digitalWrite (4, HIGH);
digitalWrite (5, HIGH);
digitalWrite (6, HIGH);
digitalWrite (7, HIGH);
digitalWrite (8, HIGH);
}
void seven(){
digitalWrite (2, HIGH);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, LOW);
digitalWrite (6, LOW);
digitalWrite (7, LOW);
digitalWrite (8, LOW);
}
void eight(){
digitalWrite (2, HIGH);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, HIGH);
digitalWrite (6, HIGH);
digitalWrite (7, HIGH);
digitalWrite (8, HIGH);
}
void nine(){
digitalWrite (2, HIGH);
digitalWrite (3, HIGH);
digitalWrite (4, HIGH);
digitalWrite (5, HIGH);
digitalWrite (6, LOW);
digitalWrite (7, HIGH);
digitalWrite (8, HIGH);
}

void null(){
digitalWrite (2, LOW);
digitalWrite (3, LOW);
digitalWrite (4, LOW);
digitalWrite (5, LOW);
digitalWrite (6, LOW);
digitalWrite (7, LOW);
digitalWrite (8, LOW);
}