#include <iostream>
#include <iomanip>  //for the i/o manipulator setw ("set width")
#include <cstdlib>
#include <vector>   //for class vector
using namespace std;

int main()
{
	vector<double> v { //Born holding 6 doubles, but we will expand it to 7.
		 0.5,
		10.5,
		20.5,
		30.5,
		40.5,
		50.5
	};

	vector<double>::size_type n {v.size()};   //number of elements in vector

	cout << "The vector was born holding these " << n << " doubles:\n";

	for (int i {0}; i < n; ++i) {
		cout << i << "  " << setw(2) << v[i] << "\n";
	}	

	cout << "\n";
	v.push_back(60.5); //Add a new element to the end of the vector.
	n = v.size();      //We just changed the size of the vector from 6 to 7.
	cout << "Now the vector holds these " << n << " doubles:\n";

	for (int i {0}; i < n; ++i) {
		cout << i << "  " << setw(2) << v[i] << "\n";
	}	

	return EXIT_SUCCESS;
}