This program illustrates the use of the advance() function
to move an iterator a given number of positions.
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Here are the values in a list of integers:
2 4 6 8 10 12 14 16 18 20
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The 8th value in the list is 16.
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The 3rd value in the list is 6.
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The 6th value from the end of the list is 10.
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Here are the values in a vector of integers:
1 3 5 7 9 11 13 15 17 19
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The 7th value in the vector is 13.
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