#define a 19
#define b 18 
#define c 32
#define d 33 
#define e 25 
#define f 26 
#define g 14 
#define dot 27

#define incrementB 15
#define decrementB 2

int counter = 0;
int lastIncrementState = LOW;
int lastDecrementState = LOW;


void setup() {
  Serial.begin(115200);

  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT); 
  pinMode(d, OUTPUT);  
  pinMode(e, OUTPUT);  
  pinMode(f, OUTPUT);  
  pinMode(g, OUTPUT);  
  pinMode(dot, OUTPUT);

  pinMode(incrementB, INPUT);
  pinMode(decrementB, INPUT);

}

void loop() {
  int incrementState = digitalRead(incrementB);
  int decrementState = digitalRead(decrementB);

  if (counter < 0){
    counter = 0;
  }
  
  if (counter > 9){
    counter = 9;
  }

  if (digitalRead(incrementB)== HIGH && lastIncrementState == LOW){
    counter++;
    delay(500);
    Serial.println(counter);
  }

  if (digitalRead(decrementB)== HIGH && lastDecrementState == LOW){
    counter--;
    delay(500);
    Serial.println(counter);
  }
  lastIncrementState = incrementState;
  lastDecrementState = decrementState;
  display(counter);
}

void display(int n){
  switch(n)
  {
    case 0:
      zero ();
      break;
    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;
    }
  }


void zero(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,LOW);
  digitalWrite(dot,LOW);
}
void one(){
  digitalWrite(a,LOW);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dot,HIGH);
}
void two(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,LOW);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,LOW);
  digitalWrite(g,HIGH);
  digitalWrite(dot,LOW);
}
void three(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,HIGH);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,HIGH);
  digitalWrite(dot,LOW);
}
void four(){
  digitalWrite(a,LOW);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dot,LOW);

}
void five(){
  digitalWrite(a,HIGH);
  digitalWrite(b,LOW);
  digitalWrite(c,HIGH);
  digitalWrite(d,HIGH);
  digitalWrite(e,LOW);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dot,LOW);
}
void six(){
  digitalWrite(a,HIGH);
  digitalWrite(b,LOW);
  digitalWrite(c,HIGH);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dot,HIGH);
}
void seven(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,LOW);
  digitalWrite(g,LOW);
  digitalWrite(dot,LOW);
}
void eight(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,HIGH);
  digitalWrite(e,HIGH);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dot,LOW);
}
void nine(){
  digitalWrite(a,HIGH);
  digitalWrite(b,HIGH);
  digitalWrite(c,HIGH);
  digitalWrite(d,LOW);
  digitalWrite(e,LOW);
  digitalWrite(f,HIGH);
  digitalWrite(g,HIGH);
  digitalWrite(dot,HIGH);
}