Answers for "how to create a header file in c++"

how does header files work in c++

"It works by copying your entire header file into the file specifying"
"a #include. It then compiles your code after this copy and pasting."

how to declare a function in c++ header file

//somefile.h
#ifndef SOMEFILE_H
#define SOMEFILE_H
int add(int a, int b);
#endif