#include <iostream>
#include <cstdlib>
#include <vector>   //for class vector
using namespace std;

int main()
{
	vector<int> vi;        //born empty

	vi.push_back(10);      //argument is an int
	vi.push_back(20);
	vi.push_back(30);

	for (auto val: vi) {   //val is an int
		cout << val << "\n";
	}
	cout << "\n";

	vector<double> vd;     //born empty

	vd.push_back(10.5);    //argument is a double
	vd.push_back(20.5);
	vd.push_back(30.5);

	for (auto val: vd) {   //val is a double
		cout << val << "\n";
	}

	return EXIT_SUCCESS;
}