#include The header file is part of the program via include. # "is the logo. # ifndef bookstore_h // If you do not define BookStore_H # define bookstore_h // So defined boionStore_h # Endif-d After adding Pretreatment constant naming The role of space is to prevent the name of the global namespace format The name in the Using Namespace C standard library is declared in a namespace called STD, which is invisible in our program file unless we show Make them visible .using prompt tells our compiler to use the name declared in the namespace STD.
