// constructing vectors #include <iostream> #include <vector> int main () { // constructors used in the same order as described above: std::vector<int> first; // empty vector of ints std::vector<int> second (4, 100); // four ints with value 100 std::vector<int> third (second.begin(), second.end()); // iterating through second std::vector<int> fourth (third); // a copy of third std::cout << "The contents of second are:"; for (std::vector<int>::iterator it = second.begin(); it != second.end(); ++it) { std::cout << ' ' << *it; } std::cout << '\n'; // the iterator constructor can also be used to construct from arrays: int myints[] = {16, 2, 77, 29}; std::vector<int> fifth (myints, myints + sizeof(myints) / sizeof(int) ); std::cout << "The contents of fifth are:"; for (std::vector<int>::iterator it = fifth.begin(); it != fifth.end(); ++it) { std::cout << ' ' << *it; } std::cout << '\n'; return 0; }
