creating an array

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C#

I need to write a program that: put up and divided by two arrays of elements. Arrays made up of equal numbers of cells (the number of user input). Array to be completed during the dialogue. The composition must be carried out as follows: a first array of first array element to the second last element of an array of first graders, second element of the array with the second-last element, and so on. The result should be made out to the third array.
Division must be carried out as follows: The second last element of the array divided by the first
the last element of the array, the second-last element of the array divided by the
the first array of second-last item, and so on. The results must be recorded in the fourth array. Line up an array of data summarized in ascending / descending order and enter the fifth array.
The original data and the results tabulated form, print the screen.

I really need your help, I don't know how to create an array ;/