#define A 2
#define B 3
#define C 4
#define D 5
#define E 6
#define F 7
#define G 8
#define N 9

int button1=13;
int buttonup;
int button2=12;
int buttondown;
int counter = 0;
int button3=11;
int buttonres;
void setup()
{

  for(int i=2;i<10;i++){
  pinMode(i, OUTPUT);
  }
  pinMode(button1,INPUT);
}

void loop()
{
  buttonup=digitalRead(button1);
  if(buttonup==HIGH){
    counter=counter+1;
    if(counter==10)
      counter=0;
    while(1){
      buttonup=digitalRead(button1);
      if(buttonup==LOW)
      return;
       }
    }
  applied(counter);

  buttondown=digitalRead(button2);
  if(buttondown==HIGH){
    counter=counter-1;
    if(counter<0)
      counter=9;
    while(1){
      buttondown=digitalRead(button2);
      if(buttondown==LOW)
      return;
      }
    }
  applied(counter);

  buttonres=digitalRead(button3);

  if(buttonres==HIGH){

    counter=0;
        while(2){
      buttonres=digitalRead(button3);
      if(buttonres==LOW)
      return;

      }
  }

  applied(counter);

  }
void applied (int number){

  switch (number) {
  case 0:
  digitalWrite(A,LOW);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,LOW);
  digitalWrite(E,LOW);
  digitalWrite(F,LOW);
  digitalWrite(G,HIGH);
  digitalWrite(N,HIGH);
    break;
  case 1:
 digitalWrite(A,HIGH);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,HIGH);
  digitalWrite(E,HIGH);
  digitalWrite(F,HIGH);
  digitalWrite(G,HIGH);
  digitalWrite(N,HIGH);// 1 number
    break;
    case 2:
  digitalWrite(A,LOW);
  digitalWrite(B,LOW);
  digitalWrite(C,HIGH);
  digitalWrite(D,LOW);
  digitalWrite(E,LOW);
  digitalWrite(F,HIGH);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 2 number
    break;
    case 3:
  digitalWrite(A,LOW);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,LOW);
  digitalWrite(E,HIGH);
  digitalWrite(F,HIGH);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 3number
    break;
    case 4:
  digitalWrite(A,HIGH);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,HIGH);
  digitalWrite(E,HIGH);
  digitalWrite(F,LOW);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 4 number
    break;
    case 5:
  digitalWrite(A,LOW);
  digitalWrite(B,HIGH);
  digitalWrite(C,LOW);
  digitalWrite(D,LOW);
  digitalWrite(E,HIGH);
  digitalWrite(F,LOW);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 5 number
    break;
    case 6:
  digitalWrite(A,LOW);
  digitalWrite(B,HIGH);
  digitalWrite(C,LOW);
  digitalWrite(D,LOW);
  digitalWrite(E,LOW);
  digitalWrite(F,LOW);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 6 number
    break;
    case 7:
  digitalWrite(A,LOW);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,HIGH);
  digitalWrite(E,HIGH);
  digitalWrite(F,HIGH);
  digitalWrite(G,HIGH);
  digitalWrite(N,HIGH);// 7 number
    break;
    case 8:
  digitalWrite(A,LOW);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,LOW);
  digitalWrite(E,LOW);
  digitalWrite(F,LOW);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 8 number
    break;
  case 9:
  digitalWrite(A,LOW);
  digitalWrite(B,LOW);
  digitalWrite(C,LOW);
  digitalWrite(D,LOW);
  digitalWrite(E,HIGH);
  digitalWrite(F,LOW);
  digitalWrite(G,LOW);
  digitalWrite(N,HIGH);// 9 number
    break;

  }
}