It’s about the usage of the function round. References http://www.cplusplus.com/reference/cmath/round/

Descritpion Submission There are 2 major points here, pure virtual function and static member variable. References https://en.cppreference.com/w/cpp/language/static

Description Solution

It’s interesting to inherit the exception class.

Preprocessors sometimes only do dull string replacement jobs but with amazing effects. References https://fenghe.us/the-c-preprocessor/ http://www.cplusplus.com/doc/tutorial/preprocessor/

C++ You may find this information helpful when completing this challenge in C++. To consume the whitespace or newline between the end of a token […]

Templates Go Further Explicit(full) template Specialization