You can use arrays of numbers just like variables. The array cells are numbered from 0 to N, N being the size of the array minus one. Storing a value in the 0th cell is easy. It works just like a simple variable:
5 sixteen 0 th !
Which will store '5' in the 0th cell. So storing '7' in the 8th cell is done like this:
7 sixteen 8 th !
Of course when you want to store a value in the first, second or third cell you have to use 'TH' too, since it is a word. If you don't like that try defining 'ST', 'ND' and 'RD' yourself:
: st th ; : nd th ; : rd th ; 4 sixteen 1 st ! 5 sixteen 2 nd ! 6 sixteen 3 rd !
Isn't 4tH wonderful? Fetching is done the same of course:
sixteen 0 th @ sixteen 4 th @
Plain and easy.