int led[7]={19,18,5,17,16,4,0};
int button1=12;
int button2=14;
int count=0;
void setup() {
  for(int i=0; i<7; i++)
  {
    pinMode(led[i], OUTPUT);
  }
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
}
void loop() {
int button1State = digitalRead(button1);
int button2State = digitalRead(button2);
if(button1State==0)
  { 
  int count=0;
  while(count>=0)
  {
    Serial.println(count);
    printnumber(count);
    delay(500);
    count++;
  }
  }
if(button2State==0)
  { 
  int count=9;
  while(count>=0)
  {
    Serial.println(count);
    printnumber(count);
    delay(500);
    --count;
  }
  }  
  }
void printnumber(int count)
{
if(count==0) 
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[4], HIGH);
  digitalWrite(led[5], HIGH);
}
else if(count==1)
{
  alloff();
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
}
else if(count==2)
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[1], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[4], HIGH);
  digitalWrite(led[6], HIGH);
}
else if(count==3)
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[6], HIGH);
 
}
else if(count==4)
{
  alloff();
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[5], HIGH);
  digitalWrite(led[6], HIGH);
}
else if(count==5)
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[5], HIGH);
  digitalWrite(led[6], HIGH);
}
else if(count==6) 
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[4], HIGH);
  digitalWrite(led[5], HIGH);
  digitalWrite(led[6], HIGH);
}
else if(count==7) 
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[5], HIGH);
}
else if(count==8)
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[4], HIGH);
  digitalWrite(led[5], HIGH);
  digitalWrite(led[6], HIGH);
}
else if(count==9)
{
  alloff();
  digitalWrite(led[0], HIGH);
  digitalWrite(led[1], HIGH);
  digitalWrite(led[2], HIGH);
  digitalWrite(led[3], HIGH);
  digitalWrite(led[5], HIGH);
  digitalWrite(led[6], HIGH);
}
} 
void alloff(){
  for(int i=0; i<7; i++){
    digitalWrite(led[i], LOW);
  }
}