C++primer 9.3.2节练习

练习9.23

四个数的值将会相同，都是c容器中那一个唯一的值；

练习9.24

#include <iostream>
#include <vector>
#include <list>
#include <deque>
#include <string>
#include <iterator>

using namespace std;


int main()
{
    vector<int> v{ 1,2,3,4,5 };
    cout << v.at(0) << endl;
    cout << v[0] << endl;
    cout << v.front() << endl;
    cout << *(v.begin()) << endl;
    vector<int> v1;
    try {
        if (v1.begin() ==v1.end())
            throw out_of_range("error");
        v1.at(0);
    }
    catch (out_of_range err) {
        cout << err.what() << endl;
    }
    system("pause");
    return 0;
}