c++ primer 5.5.2节练习答案

练习5.21

#include <iostream>
#include <string>
#include <cstring>
#include <vector>
using namespace std;
int main()
{
    vector<string> str;
    string str1;
    while (cin >> str1)
    {
        auto last = str.end();
        if (str.size() != 0 && str1 == (*(last-1)) && isupper(str1[0]))
        {
            cout << str1 << endl;
            break;
        }
        else
            str.push_back(str1);
    }
    system("pause");
    return 0;
}