/**
* @author AlbertDarren
* @contact 2563491540@qq.com
*/
#include <iostream>
#include <vector>
#include <list>
#include <deque>

using namespace std;

int main_15()
{
    vector<int> v1({-1,2,1,4,7,6});
    vector<int>::reference first=v1.front();
    cout <<"The first element in the vector is "<< first << endl;
    first=0;
    cout <<"The first element in the vector is "<< *v1.begin() << endl;
    cout <<"The last element in the vector is "<< v1.back() << endl;
    v1.back()=-1;
    cout <<"The last element in the vector is "<< *--v1.end() << endl;
    cout << "The second element in the vector is " <<v1[1]<< endl;
    cout << "The fourth element in the vector is " <<v1.at(3)<< endl;
    v1[1]=5,v1.at(3)=3;
    cout << "The second element in the vector is " <<v1[1]<< endl;
    cout << "The fourth element in the vector is " <<v1.at(3)<< endl;
    cout << "index overflow "<<v1[v1.size()+5]<< endl;
    try
    {
        cout << v1.at(v1.size()+5) << endl;
    }
    catch(out_of_range)
    {
        cout << "index out of range" << endl;
    }
    return 0;
}