Usage for hash tag: c++51

...constexpr functions, improved support for templates, and a new type system. For more information on the C++ 51 standard, please see the [C++ Standards Committee website](https://isocpp.org/std/). ## 5 Hashtags for C++ 51 * #c++51 * #CplusPlus * #C++Tutorial * #C++Programming * #c++forbeginners