Read a string line by line using c++

Question

I have a std::string with multiple lines and I need to read it line by line. Please show me how to do it with a small example.

Ex: I have a string

Answer 1

If you'd rather not use streams:

int main() {
  string out = "line1\nline2\nline3";
  size_t start = 0;
  size_t end;
  while (1) {
    string this_line;
    if ((end = out.find("\n", start)) == string::npos) {
      if (!(this_line = out.substr(start)).empty()) {
        printf("%s\n", this_line.c_str());
      }

      break;
    }

    this_line = out.substr(start, end - start);
    printf("%s\n", this_line.c_str());
    start = end + 1;
  }
}