Integral constant expression (C++98)| en.cppreference.com
The storage class specifiers are a part of the decl-specifier-seq of a name's declaration syntax. Together with the scope of the name, they control two independent properties of the name: its storage duration and its linkage.| en.cppreference.com
Initialization of a variable provides its initial value at the time of construction. | en.cppreference.com