how to convert a string to integer with C++

Does anyone know how I could convert a string into int in C++?

I have the code ready set up but the result isn't what I expect.

example:

year = date_input.substr(second_slash, 4);

stringstream ss(year);
int in_year;
ss>> in_year;


let me know.. thanks!!

int in_year = atoi(ss.c_str());

Without questioning Superman’s suggestion, I’d like to know what didn’t work in your code.
This fragment:

Code:

---

        std::string year("1234");
        std::stringstream ss(year);
        int in_year;
        ss>> in_year;

---

produces correct result.
What did your call

Code:

---

year = date_input.substr(second_slash, 4);

---

returned? What was date_input? And what was second_slash?