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// valarray constructor example
#include <iostream> // std::cout
#include <valarray> // std::valarray, std::slice
int main ()
{
int init[]= {10,20,30,40};
std::valarray<int> first; // (empty)
std::valarray<int> second (5); // 0 0 0 0 0
std::valarray<int> third (10,3); // 10 10 10
std::valarray<int> fourth (init,4); // 10 20 30 40
std::valarray<int> fifth (fourth); // 10 20 30 40
std::valarray<int> sixth (fifth[std::slice(1,2,1)]); // 20 30
std::cout << "sixth sums " << sixth.sum() << '\n';
return 0;
}
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