Partial sum in Standard ML?

Question

Im new to functional programming and I have an assignment to compute partial sum of a list. E.g. - psum [1,1,1,1,1]; val it = [1,2,3,4,5] : int list

Here is the my cod

Answer 1

Your question is a little broad, but here's one way to sum a list. Perhaps you can adapt it to your purposes:

fun sum [] = 0
  | sum (h::t) = h + sum t