im trying to learn c++ on yown but i dont understand some of the things the question is asking im still a beginner

Write an intereactive program which allows the user to enter values into subscrioted variable 'x' of lenth n determined by the user. Also the program should dispalys all elements with even subscripts only all horizontally and calculates and displays the sum of the element with subscript only
Please do not double-post. The other thread:
http://www.cplusplus.com/forum/beginner/189762/
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