This program illustrates the use of the STL replace_copy_if() algorithm to
copy all values from one vector of integers to another and simultaneously
replace, in the output, all values that satisfy a given predicate with a
given alternate value.
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Here are the values in the vector v1:
1 2 2 3 4 5 2 3 6 7 8 9
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Here are the values in the vector v2:
101 102 103 104 105 106 107 108 109 110 111 112 113 114
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Now we copy all values from v1 to v2, starting at the 3rd value of v2,
and simultaneously replace each value that's divisble by 3 with 123.
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Here are the revised values in v2:
101 102 1 2 2 123 4 5 2 123 123 7 8 123
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The iterator returned by the algorithm is pointing at
the end of the vector v2.
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