How to parse a string to an int in C++?

Question

What\'s the C++ way of parsing a string (given as char *) into an int? Robust and clear error handling is a plus (instead of returning zero).

Answer 1

You can use stringstream's

int str2int (const string &str) {
  stringstream ss(str);
  int num;
  ss >> num;
  return num;
}