Notice that we call the function ``addArray'' three times. Each time
we give the same array (y) as a parameter, but each time we give a
different size. We can safely use any size we want as long as it is
smaller than the actual size of the array. So the first two calls are
OK--we are just directing ``addArray'' to add up half of the array in
the second call. But we must be careful not to include calls like the
third one. In this case, ``addArray'' will happily read past the end
of the array with the usual unpredictable results.
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