int pushbutton1 = 2;
int pushbutton2 = 3;
int led[5]={4,5,6,7,8};

void setup()
{
    for(int i=0; i<=4; i++) {pinMode(led[i], OUTPUT);}
    pinMode(pushbutton1, INPUT);
    pinMode(pushbutton2, INPUT);
}

void loop()
{
  pushbutton1 = digitalRead(2);
  pushbutton2 = digitalRead(3);

  if (pushbutton1 == HIGH) 
   {
    for(int i=0; i<=4; i++) {digitalWrite(led[i],HIGH); delay(200);}
    for(int i=0; i<=4; i++) {digitalWrite(led[i],LOW);}
   }
  if (pushbutton2 == HIGH) 
   {
    for(int i=4; i>=0; i--) {digitalWrite(led[i],HIGH); delay(200);}
    for(int i=4; i>=0; i--) {digitalWrite(led[i],LOW);}
   }
}