Sorry if my code was a bit overkill. If you want to familiarize with arrays, play around with http://arduino.cc/en/Tutorial/Loop understand how it works and modify it 
If you do this:
int a=10;
int b=11;
int c=12;
// b + c = 23
And all variables describe the same thing, as for instance a series of out pins, using arrays will simplify thing a whole lot.
This is what happens:
int all = { 10 , 11 , 12 } ;
// all[1] + all[2] = 23
Any specific questions, just ask.