#include#include using namespace std; int main() { double x = 2; double y = 3; double length = sqrt(x*x + y*y); cout << "The length of the vector is: " << length << endl; return 0; }
#includeIn this case, the package library would be C++ STL (Standard Template Library) because we used the `vector` template.#include #include using namespace std; double vectorLength(vector v) { double sum = 0; for (double x : v) sum += x*x; return sqrt(sum); } int main() { vector v {3, 4}; double length = vectorLength(v); cout << "The length of the vector is: " << length << endl; return 0; }