I need to create an array with 100 numbers (1-100) and then calculate how much it all will be (1+2+3+4+..+100 = sum).

I don't want to enter these numbers into the arrays manually, 100 spots would take a while and cost more code.

I'm thinking something like using variable++ till 100 and then calculate the sum of it all. Not sure how exactly it would be written. 
But it's in important that it's in arrays so I can also say later, "How much is array 55" and I can could easily see it.