int A=10;
int B=11;
int C=2;
int D=3;
int E=4;
int F=5;
int G=6;
int P=7;
int d1=8;
int d2=9;
int num = 0;
long startTime;

void setup() {
  // put your setup code here, to run once:
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(P, OUTPUT);
  pinMode(d1, OUTPUT);
  pinMode(d2, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(millis() - startTime > 960)
  {
    num++;
    if(num == 100){
      num = 0;
    }
    startTime = millis();
  }
  dv();
  
}

void dv(){
  int b=num%10;
  int a=num/10;

  digitalWrite(d1, HIGH);
  digitalWrite(d2, LOW);
  showDigit(b);
  delay(20);
  clear();
  digitalWrite(d1, LOW);
  digitalWrite(d2, HIGH);
  showDigit(a);
  delay(20);
  clear();
}

void showDigit(int digit) {
  switch(digit) {
    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 cycle(){
  zero();
  delay(500);
  one();
  delay(500);
  two();
  delay(500);
  three();
  delay(500);
  four();
  delay(500);
  five();
  delay(500);
  six();
  delay(500);
  seven();
  delay(500);
  eight();
  delay(500);
  nine();
  delay(500);
}

void one(){
  digitalWrite(A, LOW);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, LOW);
  digitalWrite(P, LOW);
}
void two(){
  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, LOW);
  digitalWrite(D, HIGH);
  digitalWrite(E, HIGH);
  digitalWrite(F, LOW);
  digitalWrite(G, HIGH);
  digitalWrite(P, 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(P, 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(P, 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(P, 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(P, LOW);
}
void seven(){
  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, LOW);
  digitalWrite(P, 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(P, LOW);
}
void nine(){
  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, HIGH);
  digitalWrite(E, LOW);
  digitalWrite(F, HIGH);
  digitalWrite(G, HIGH);
  digitalWrite(P, LOW);
}
void zero(){
  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, HIGH);
  digitalWrite(E, HIGH);
  digitalWrite(F, HIGH);
  digitalWrite(G, LOW);
  digitalWrite(P, LOW);
}
void clear(){
  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, LOW);
  digitalWrite(P, LOW);
}