lst-0081-book.cpp
// https://godbolt.org/z/ro6fdsvT9
#include <vector>
#include <iostream> // cout
using std::vector; using std::cout;
int main() {
vector data{ 12, 100, -1, 0, }; // vector<int>
for(auto& val : data)
val *= 2; // double it
for(const auto val : data)
cout << val << " ";
cout << "\n";
}