This program illustrates the use of the STL count_if() algorithm to count the
number of integer values in a vector of integers that are divisible by 3.
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Here are the contents of v1:
1 2 3 4 5 6 7 8 9 10 11 12
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The number of values in v1 that are divisible by 3 is 4.
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Here are the contents of v2:
10 20 40 50 70 80 100 110 130 140
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The number of values in v1 that are divisible by 3 is 0.
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