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

int main()
{
	vector<double> v;   //Born empty, but capable of holding doubles.

	for (;;) {
		cout << "Please input a double (or control-d when done): ";
		double d {0.0};
		cin >> d;
		if (!cin) {      //if the user typed control-d,
			break;   //out of the for loop
		}
		v.push_back(d);  //Call member function push_back belonging to v

		//cout << "v.size() = " << v.size() << "\n";
		//cout << "capacity() =  " << v.capacity() << "\n"; //doubles
	}

	cout << "\n\n";
	cout << "Here are the " << v.size() << " doubles that you input:\n";

	for (const auto& d: v) {     //Loop through all the doubles in v.
		cout << d << "\n";   //d is a double because v holds doubles.
	}

	return EXIT_SUCCESS;         //Nothing we have to remember to delete.
}