int a = 23;
int b = 22;
int c = 15;
int d = 4;
int e = 2;
int f = 21; 
int g = 19;
int pins [7]={a,b,c,d,e,f,g};

void setup() 
{ for (int i=0;i<7;i++)
{ 
  pinMode(pins[i], OUTPUT);
   }
}

void loop() 
{ 
  digitalWrite(a, HIGH);
}