converting string to int in C++

Question

I am trying to convert a string I read in from a file to an int value so I can store it in an integer variable. This is what my code looks like:

ifstream sin         


        

Answer 1

The quick fix is to use line.c_str() which provides a const char* for atoi().

A better solution (if available) may be to use boost::lexical_cast(line). This is a neater version of the C++ism of pushing things into and out of a std::stringstream which has all the type conversions you are likely to need.