I am learning C++ and i am really stuck on a question. Can someone please help because its driving me crazy, please help.

The question is:

To find value of the sum S for which formula composed. Summation (The act or process of adding) to continue until next composed |a[i]|> E.Ispolzovat a heading file and indexes on function for calculation composed under the formula and indexes on a variable.

What the hell is it about? I need to create a formula to complete the question. Can someone please help

Janet