// test swap of vectors
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    vector<int> col1;    // vector container for integer elements
    vector<int> col2;

    // append elements with values 1 to 6
    for (int i=1; i<=6; ++i) {
        col1.push_back(i);
	col2.push_back(i+10);
    }
        col2.push_back(99);// print all elements followed by a space
    for (int i=0; i<col1.size(); ++i) {
        cout << col1[i] << ' ';
    }
    cout << endl;

    for (int i=0; i<col2.size(); ++i) {
        cout << col2[i] << ' ';
    }
    cout << endl;

    col1.swap(col2);

    for (int i=0; i<col1.size(); ++i) {
        cout << col1[i] << ' ';
    }
    cout << endl;

    for (int i=0; i<col2.size(); ++i) {
        cout << col2[i] << ' ';
    }
    cout << endl;


}