#include <iostream>
#include <cstdlib>
#include <vector>
using namespace std;

int main()
{
	vector<int> v1;           //born empty, but we can insert int's later
	vector<int> v2(3);        //born containing 0, 0, 0
	vector<int> v3(3, 10);    //born containing 10, 10, 10

	const int a[] = {10, 20, 30};
	const size_t n = sizeof a / sizeof a[0];
	vector<int> v4(a, a + n); //born containing 10, 20, 30

	vector<int> v5 = v4;      //born containing 10, 20, 30: copy constructor

	cout << "v5.empty() == " << v5.empty() << "\n"
		<< "v5.size() == " << v5.size() << "\n"
		<< "v5.capacity() == " << v5.capacity() << "\n\n";

	cout << v5[1] << "\n";    //cout << v5.operator[](1) << "\n";
	v5[1] = 21;               //Change the 20 to 21: v5.operator[](1) = 21;
	cout << v5[1] << "\n";    //cout << v5.operator[](1) << "\n";

	if (v3 < v4) {            //Compare two vectors: if (operator<(v3, v4)) {
		v1 = v5;              //assignment: v1.operator=(v5);
	}

	return EXIT_SUCCESS;
}