The Listing 7-2 in the book is inconsistent with code in [Listing 7-3 at Github](https://github.com/JLospinoso/ccc/blob/master/chapter_7/listing_7_3.cpp). The "std::runtime_error" should read "std::overflow_error".
The Listing 7-2 in the book is inconsistent with code in Listing 7-3 at Github.
The "std::runtime_error" should read "std::overflow_error".