str to int

#include <iostream>
#include <vector>
#include <utility>
#include <string>
#include <fstream>

using namespace std;


int main()
{
    vector <int> a;
    vector <string> v;
    string path = "noice.txt";
    ifstream fin;
    fin.open(path);

    if (!fin.is_open())
    {
        cout << "error" << endl;
    }
    else
    {
        string str;
        while (!fin.eof())
        {
            getline(fin, str);
            v.push_back(str);
        }
    }
    fin.close();
    for (int i = 0; i < (int)v.size() - 1; i++)
    {
        try {
            int res = stoi(v[i]);
            a.push_back(res);
        }
        catch (std::invalid_argument e) {
            cout << "caught invalid argument exception\n";
            cout << i;
        }
    }
    return 0;
}