This program illustrates the reverse() and sort()
member functions for list objects.
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For the starting list we have:
Size = 10
Contents: 17 12 14 19 23 15 61 20 81 11
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Now we sort the list in ascending order:
Size = 10
Contents: 11 12 14 15 17 19 20 23 61 81
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Next we reverse the list, which will give the values in descending order:
Size = 10
Contents: 81 61 23 20 19 17 15 14 12 11
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Finally we sort the list according to the criterion that one value
comes before another if and only if it has a smaller digit sum:
Size = 10
Contents: 20 11 12 23 14 15 61 17 81 19
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