How do I use atoi function with strings in C++

Question

This is a basic question. I use C++ but not C++11. Now, I want to convert a string to an integer. I have declared like this:

string s;

int i = atoi(s);

However, this shows an error that such a conversion is not possible. I checked out the internet and I found that C++11 has stoi() but I want to use atoi itself. How can I do it? Thanks!

Answer 1

Convert it into a C string and you're done

string s;

int i = atoi(s.c_str());