We informally define the term \"corresponding element\" as follows: The first el

Question

We informally define the term "corresponding element" as follows: The first element in an array and the last element of the array are corresponding elements. Similarly, the second element and the element just before the last element are corresponding elements. The third element and the element just before the element just before the last element are corresponding elements -- and so on. Given an array a and a variable n that contains the number of elements in a , write an expression for the corresponding element of a[i] .

Explanation / Answer

For an array a containing n elements, the first element is a[0] and the last element is a[n - 1] If you don't know the value of n, you can still find it with a.length. So, the last element can also be written as a[a.length - 1] Then, the corresponding element of the first element a[0] is the last element a[a.length - 1] Likewise, the corresponding element of the second element a[1] is the second-to-last element a[a.length - 1 - 1] -- that is, a[a.length - 2] For a[2], the corresponding element is a[a.length - 3], and so on. In general, the corresponding element of a[i] is a[a.length - (i + 1)]. Another way of writing this is a[a.length - 1 - i].

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